This disclosure describes systems, methods, and apparatus for a quick-release adapter between two tripod/bipod/monopod interfaces, wherein a clamping side of the adapter is configured to clamp onto two different types of interfaces or rails such as Arca and Picatinny/Weaver/NATO.

An apparatus for clamping a work piece is provided. The apparatus includes a base plate to support the work piece; at least one clamp body fixed to the base plate; at least one fastener fixing the at least one clamp body to the base plate; and a protruding piece having at least a portion thereof inserted into the clamp body and an end thereof extending from a lateral face of the clamp body, the protruding piece including a hollow point tip at the opposite end, where outer and inner lateral surfaces of the hollow point tip join to define a circular sharp edge at the opposite end of the protruding piece.

A duct support device is provided. The device includes a clamp assembly having a channel dimensioned to removably secure to a support structure, wherein a width of the channel is selectively adjustable via actuation of a pair of clamp handles affixed to the clamp assembly. A first arm member is affixed to the clamp assembly at a proximal end of the first arm member. A second arm member is pivotally affixed to a distal end of the first arm member. A third arm member is perpendicularly affixed to a distal end of the second arm member. A brace is affixed to the third arm member parallel to a longitudinal axis of the third arm member, wherein the brace extends along a length of an upper side of the third arm member. In some embodiments, a fourth arm member is perpendicularly affixed to a distal end of the third arm member.

A hold-down clamping apparatus comprising a hold-down clamp with body having a top lip and pair of guide legs disposed between a central screw in the body and a support having holes in vertical alignment with the legs and the screw for securing and holding down a sheet material for processing. The screw is threaded through the support screw hole as the legs are inserted within support holes until the top lips contacts the sheet material to hold down the material and to prevent twisting of the hold-down clamp. Supports with clamps may be fastened to tools or supports. In one embodiment, the support has a grid of holes for securing a plurality of materials with hold-down clamps. In another embodiment, the hold-down clamp comprises a top lip and a guide beam slotted in a support and secured.