DW Claw Hook Clamp w/ Convertible L Arm (DWSM2141)This DW Claw Hook Cowbell and Accessory Clamp quickly and easily attaches to your bass drum hoop. It includes an L Arm (DWSMTA905) and is a 1 2" to 9. 5mm for mounting percussion accessories. Features: Quickly and easily attaches to your bass drum hoop Includes an L Arm (DWSMTA905) Fits 1 2" to 9. 5mm diameter for mounting percussion accessories Rounded hook design Note: DW claw hook clamps have a rounded hook that can dent or damage bass drum hoops