"V" Clamp with Single Ball-Type. 1/2" L-Arm with "V" Memory Lock. DW L-Arms offer a wide combination of sizes and configurations to accommodate drums, cowbells or other percussion accessories. They can be mounted on either DogBones or Mega Clamps, allowing virtually any setup imaginable (memory locks included). • MFSKU DWSM991 • UPC 647139108216