Super clamping strength and stabilityStrong construction， made of stainless steel and aluminum alloyProvide both 1/4" and 3/8" screwBig load of up to 2kg with mini dimensionsSpecification:Material: Aluminum AlloyThread: one 1/4"-20 and one 3/8"Minimum opening diameter :10mmMaximum opening diameter: 41mmWeight: 110gPackage Contents:1x Crab Pliers Clip