An anchoring system is disclosed, having an anchor where one end is plurality of prongs configured to expand and retain a substrate when engaged by a threaded rod pin and the other end is a partially threaded opening configured to engage the threaded rod pin. The threaded rod pin has a section of exterior threading that will engage with both the coupler and the anchor. A drill depth measuring guide having a hollow threaded holder to accept a dill bit. The holder has a setscrew to secure it to the drill bit and an exterior threaded cylinder to matingly engage a locking nut and a collar that can be threaded onto the holder at various locations to allow for different drill depths.

a dust collector for electrical drill, comprising: a sleeve portion, a supporting portion, and a dust collecting portion; the sleeve portion disposed in front of the fixing part of the electrical drill; the supporting portion coupled with the sleeve portion, and surrounding and isolating a rotating part of the electrical drill; the dust collecting portion coupled with one end of the supporting portion and covered the drill bit; the dust collecting portion including a telescoping sleeve body and a spring. Besides, the dust collector adds a stop device which comprises a ruler paralleled to the dust collection portion and a stopper disposed in the outside of the supporting portion, whereby collecting the dust when drilling operation and controlling precisely the drilling depth.

Disclosed are systems and devices for controlling the closing of a door. A head unit is to be installed in a doorjamb, comprising a chamber filled at least in part with a shear thickening fluid. A piston is connected to a cap and configured to exert pressure against the shear thickening fluid in response to a force applied to the cap. The systems and devices provide an adjustable design that resists door slamming and aggressive closure, serving as a safety device as well as noise, damage and pet control around doors (preventing closure if desired). An install kit provides exact location, depth control and guide to place over the head unit to tap it into place with a hammer.

A drill stop for a drilling tool with a shaft, wherein part of an outer surface has a stop-1 geometry, and stop-sleeve placed on the shaft, a stop-element with stop-3 geometry is provided, movable in axial direction and can be brought into engagement with the stop-1 geometry, the stop-element has locking-3 geometry and shaft has holding-1 geometry with respect to the axis of symmetry, wherein a) the stop-sleeve has locking-2 geometry on the end face, which can be brought into contact with locking-3 geometry, wherein the stop-sleeve has holding-2 geometry, which can be brought into closure with the holding-1 geometry, or b) a locking-part, which has holding-4 geometry, which can be brought into positive or non-positive engagement with holding-1 geometry, the locking-part having locking-4 geometry which can be brought into active contact with locking-3 geometry, or the stop-1 geometry is a recess and stop-3 geometry is a movable locking-pawl.