According to one implementation, a drill includes the first cutting edges, the second cutting edges and a deflection reducer. The first cutting edges drill a prepared hole to a workpiece. The first cutting edges are formed in a tip side of the drill. The first point angle and each first relief angle of the first cutting edges continuously or intermittently decrease from the tip side toward a rear end side of the drill. The second cutting edges finish the prepared hole. The second cutting edges are formed at positions away in the rear end side from the first cutting edges. The second cutting edges have the second relief angles at a maximum diameter position. The deflection reducer reduces deflection of the second cutting edges. The deflection reducer is formed between the first cutting edges and the second cutting edges. The deflection reducer is inserted into the prepared hole.

Disclosed is a system for working on a workpiece. The system may include a driver and selected tool. The tool may form a portion of a system that augments the tool in operating or performing hole making on a selected workpiece. The tool may include a plurality of portions and/or characteristics to work on the workpiece.

Disclosed is a system for working on a workpiece. The system may include a driver and selected tool. The tool may form a portion of a system that augments the tool in operating or performing hole making on a selected workpiece. The tool may include a plurality of portions and/or characteristics to work on the workpiece.

A concrete anchor capable of resisting large loads while requiring minimal embedment depth. The system includes a concrete structure including a cylindrical opening in the concrete surface thereof. The system also uses an anchor which includes a sleeve and a plug. The sleeve includes at least two legs extending toward a first end of the sleeve. The plug includes an increasing diameter portion disposed toward a first end of the plug. The plug includes a locking opening. After installation, legs of the sleeve extend radially outward past the wall and the increasing diameter portion prevents inward movement of the legs to lock the sleeve and the plug in turn in the concrete cylindrical opening. Furthermore, dynamic loading on the plug via the locking opening when the anchor is in use generates a dynamic radially outward force on the legs to secure the anchor in the concrete hole.

A machining tool forms a first relief surface, a valve seat surface, and a second relief surface by cutting the inner periphery of a valve seat blank having an opening. The machining tool is provided with: a tool body rotationally driven about an axis; a plurality of cutting tools rotating with the tool body; a cartridge mounted to the tool body so as to be capable of moving forward and backward along the axis; and a cam in contact with the base end surface of the cartridge and moving the cartridge forward and backward. At least one of the plurality of cutting tools is mounted to the cartridge.

A rotary tool, comprising: a tool main body comprising a clamping section and a tool head; an exchangeable first cutting insert having at least one first cutting region having a first cutting edge, wherein the first cutting insert can be inserted into an insert groove of the tool main body from the front side of the tool head and can be fastened therein in a rotationally fixed manner; and an exchangeable second cutting insert fastened to the tool head and offset toward the clamping section in the axial direction of the rotary tool relative to the first cutting insert and which has an insert main body and at least one second cutting region having at least one second cutting edge. A fastening means for the second cutting insert is arranged in the insert groove of the first cutting insert. Also, a cutting insert set and a tool main-body set.

A rotary tool, comprising: a tool main body comprising a clamping section and a tool head; an exchangeable first cutting insert having at least one first cutting region having a first cutting edge, wherein the first cutting insert can be inserted into an insert groove of the tool main body from the front side of the tool head and can be fastened therein in a rotationally fixed manner; and an exchangeable second cutting insert fastened to the tool head and offset toward the clamping section in the axial direction of the rotary tool relative to the first cutting insert and which has an insert main body and at least one second cutting region having at least one second cutting edge. A fastening means for the second cutting insert is arranged in the insert groove of the first cutting insert. Also, a cutting insert set and a tool main-body set.

A hole saw assembly is provided. The hole saw assembly includes an arbor, a hole saw, a pilot drill and an ejection member. The pilot drill includes a lock receiving groove member. The pilot drill coaxial with the hole saw extends through and beyond the hole saw. The ejection member configured to slide along the pilot drill. The ejection member includes a biasing member and a barrel coaxially aligned with the pilot drill. The ejection member also includes a sleeve coaxially aligned with the barrel. The barrel and the sleeve are configured to axially slide along the pilot drill. The ejection member further includes at least one locking member configured to engage with the lock receiving groove member to restrict the slidable movement of the barrel and the sleeve with respect to the pilot drill.

A hole saw assembly is provided. The hole saw assembly includes an arbor, a hole saw, a pilot drill and an ejection member. The pilot drill includes a lock receiving groove member. The pilot drill coaxial with the hole saw extends through and beyond the hole saw. The ejection member configured to slide along the pilot drill. The ejection member includes a biasing member and a barrel coaxially aligned with the pilot drill. The ejection member also includes a sleeve coaxially aligned with the barrel. The barrel and the sleeve are configured to axially slide along the pilot drill. The ejection member further includes at least one locking member configured to engage with the lock receiving groove member to restrict the slidable movement of the barrel and the sleeve with respect to the pilot drill.

A wall magnet anchor system is used to install magnetic anchors in wall material that can be used to magnetically hold an object to the wall, thereby avoiding the need to a conventional hook that protrudes from the surface of the wall. The anchor can include a helical thread to hold the anchor in the wall. An installation tool includes a cutting features at one end for cutting a hole in a wall to receive an anchor, and an installation feature that engages the anchor and allows a user to drive the anchor, through rotation, into the hole cut by the cutting features.