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.

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 device for securely attaching a drilling device to a drill plate provided with a plurality of positioning bores. The attachment to the drill plate including an expandable collet with balls.

A device for securely attaching a drilling device to a drill plate provided with a plurality of positioning bores. The attachment to the drill plate including an expandable collet with balls.

A rotary tool can be adapted for removing material from a workpiece such as a lower receiver. A rotary tool can have an adapter with a major diameter, and a cutter head with a minor diameter. The major diameter of the adapter can reduce deflection and chatter, while the minor diameter of the cutter head can be used to manufacture lower receivers with accuracy. The rotary tool can be adapted to be engaged with a rotary power tool.

A rotary tool can be adapted for removing material from a workpiece such as a lower receiver. A rotary tool can have an adapter with a major diameter, and a cutter head with a minor diameter. The major diameter of the adapter can reduce deflection and chatter, while the minor diameter of the cutter head can be used to manufacture lower receivers with accuracy. The rotary tool can be adapted to be engaged with a rotary power tool.

A bollard drilling jig including a base plate, an elongated bar coupled to the base plate, and at least two guide collars spaced apart from each other on the elongated bar. The at least two guide collars each include an interior channel that is sized to receive a drilling tool therethrough.

Device for making a hole in a workpiece, including a drilling tool, a supporting apparatus that is or can be assigned to the drilling tool and is configured for supporting the drilling tool on at least one supporting region, wherein the supporting apparatus includes an elongate main body that includes at least two main-body elements, at least one main-body element being mounted so as to be movable relative to at least one additional main-body element in order to change the length measurement of the main.

Device for making a hole in a workpiece, including a drilling tool, a supporting apparatus that is or can be assigned to the drilling tool and is configured for supporting the drilling tool on at least one supporting region, wherein the supporting apparatus includes an elongate main body that includes at least two main-body elements, at least one main-body element being mounted so as to be movable relative to at least one additional main-body element in order to change the length measurement of the main.

A sleeve (20) for centering fasteners during the assembly of components such as facade elements on the substructure of a building envelope includes a sleeve body (23) and a connection bracket (25). The sleeve body (23) has a plurality of sleeve elements (21, 22) which are grouped around a central center axis A and are spaced apart from each other by gaps running in the sleeve longitudinal direction. At least a first (21) and a second (22) sleeve piece are connected to each other at an axial longitudinal end of the sleeve body (23) by a separable connection bracket (25), preferably the connection bracket is separable via predetermined breaking points. Such a sleeve is used in the construction of facades, wherein it is inserted into a pilot hole of a facade element, the connection bracket is broken off and a fastener is inserted into the sleeve. Driving the fastener centers the fastener in the sleeve and the sleeve is removed from the pilot hole.