This DW Claw Hook Clamp is designed to simply, yet dependably, clamp onto both sides of the hoop of your bass drum. This places percussion instruments in a location that is both accessible and out-of-the-way without fear of slippage. Attach a cowbell, block, or other percussion instrument to the clamp via DW's patented V-Clamp which features memory lock, so it's easy to repeat you favorite setup. Included is a 1/2"-diameter L-arm but the V-Clamp can accommodate a variety of arm diameters.