The 1.9" DAC-50 QR Clamp from Desmond is an Arca-type compatible quick release clamp. Made from aluminum, the clamp is 1.9" (50mm) long, and it has a removable bull's-eye bubble level. A numbered scale on both sides of the clamp allows for precise adjustments of your camera plate. The clamp has a 3/8"-16 thread and includes a 1/4"-20 bushing adapter, so it can be mounted on most tripods or tripod heads.