A roof square for marking rafters comprising a right angle triangular body with a marking blade pivotally mounted adjacent the right angle. Either side of the square adjacent the right angle is held against the stock to be marked, and the blade used to mark either a plumb cut or a foot cut. The blade retracts to allow marks to be made at a measured depth. The tool can also be used as a conventional square to make 90 and 45 degree marks.

A layout tool is provided for use in marking a work piece to be cut. The layout tool includes a generally flat body having an even surface, a linear edge, locating indicia adjacent the linear edge, and a gripper attached to the flat body. The gripper is movable from an initial position. In the initial position, the gripper is generally aligned with the even surface of the flat body. The gripper can be moved toward the work piece from the initial position to engage the work piece when the flat body overlies the work piece.

A square gauge apparatus configured for being selectively and removably mounted on a leg of a carpenter's square has a ledge having a ledge first surface and an opposite ledge second surface, the ledge first and second surfaces being parallel and offset, a first abutment extending from the ledge and having a first abutment front surface that is perpendicular to the ledge first surface, a second abutment extending from the ledge opposite the first abutment and having a second abutment front surface that is perpendicular to the ledge second surface and parallel to and coplanar with the first abutment front surface, and a slot formed adjacent to the ledge between the first and second abutments, the slot having a slot end surface that is parallel to and coplanar with the first and second abutment front surfaces.

A square device and method of operation is disclosed. An example square device includes a first leg having a substantially same size height as width, and a second leg having a substantially same size height as width, the first leg and the second leg joined to form a substantially L-shape. The example square device also includes a substantially V-shaped groove formed all along an outward facing side of the first leg and the second leg, and a substantially flat clamping surface formed all along an inward facing side of the first leg and the second leg. When a first working article is received in the V-shaped groove formed along the first leg, and a second working article is received in the V-shaped groove formed along the second leg, the first working article is held in a substantially perpendicular orientation relative to the second working article.

One or more clamping aid tools for mounting to various squares and straight edges, including carpenter squares, framing squares, speed squares or the like, and various straight edges and rulers for easily and accurately positioning various objects, either flat and/or round, magnetic or not. The clamping aid tools can secure these squares and straight edges to various objects while they are being fitted, secured and/or welded together.

A hand tool with a lanyard attachment point has a hand tool body and a working side extending along a portion of the hand tool body and has a straight edge. A pin receiving recess in the hand tool body is parallel to and spaced from the straight edge. A channel extends into the working side transverse to the straight edge and intersects the pin receiving recess. A lanyard loop has an elongated, rigid loop body with a lanyard attaching loop end and a tool attaching end opposite the lanyard attaching loop end. The tool attaching end has a through opening transverse to the loop body where the tool attaching end is disposed in the first channel with the through opening aligned with the pin receiving recess. An anchor pin in the pin receiving recess retains the lanyard loop by extending through the through opening of the tool attaching end.

A tile square includes a right isosceles triangular substantially rigid transparent sheet with ruler indicia adjacent to the hypotenuse and one of the equal sides. A fence is provided along the other equal side. A plurality of templates are formed in the sheet between the sides and hypotenuse. The templates include a plurality of holes for a range of pipe sizes and a series of arcs defining peripheral boundaries of a closet or toilet flange. The equal sides of the tool are at least 18 inches in length.

A speed square is provided including a triangular flat plate having measurement markings indicated on at least one face, a T bar affixed to, and extending along, the length of a first side of the triangular flat plate, and an extension element hingedly connected to an end of second side of the triangular flat plate opposite the T bar. The extension element having measurement markings indicated on at least one face, such that the measurement markings of the triangular flat face continue on the extension element.

A tile square includes a right isosceles triangular substantially rigid transparent sheet with ruler indicia adjacent to the hypotenuse and one of the equal sides. A fence is provided along the other equal side. A plurality of templates are formed in the sheet between the sides and hypotenuse. The templates include a plurality of holes for a range of pipe sizes and a series of arcs defining peripheral boundaries of a closet or toilet flange. The equal sides of the tool are at least 18 inches in length.

A layout tool is provided for use in marking a work piece to be cut. The layout tool includes a generally flat body having an even surface, a linear edge, locating indicia adjacent the linear edge, and a gripper attached to the flat body. The gripper is movable from an initial position. In the initial position, the gripper is generally aligned with the even surface of the flat body. The gripper can be moved toward the work piece from the initial position to engage the work piece when the flat body overlies the work piece.