US PRO INDUSTRIAL for professionals Impact Hex Bit Socket Size: 17mm Length: 78mm 1/2" drive so will fit any 1/2" drive ratchets/bars/extensions etc. Made from strong chromium-molybdenum (Cr-Mo) steel with a phosphate finish to prote. Professional Metric impact hex bit for commercial or occasional use Hex / Allen Bit Socket Metric 17mm Allen Key socket M17 / 17mm impacted Allen Hex Key socket Manufactured from chrome molybdenum steel for strength and durability Extra long impacted bit for access into restricted hard to reach areas 1/2" drive so suitable for use with any 1/2" drive ratchet / extension / power bar etc... Total length of the impacted bit 78mm US Pro Industrial (brand) this is the more industrial brand of both Bergen and US Pro.