Size: 16mm Insertion Angle Size :3/8(9.5mm) Socket Outer Dimensions:Diameter=21.5mm Length=64mm Weight: 90g Can be used as a deep socket [Material] chrome-vanadium steel Surface Finish:Two layers of nickel chrome undercoat / matte chrome final finish [Specification]Laser marking [DIN (German Industrial Standards)/ISO (International Organization for Standardization)