Material: High performance alloy steel 6Pcs] 6mm-17mm Extra Deep Socket Adapter Bolt Nut Bit 1/4 Inch Hex Shank Impact Driver Socket Adapter Shopskc7504 I.59607120 1/4 Drive Hex Socket Bahco 6709M-4 BH6709M-4 1/4-Inch Socket Driver For Hex Head Screws Bahco Grips Product details : BAHCO 6709M-8 SOCKET 1/4 Strengths Knurled shank for finger turning of free running fasteners Not suitable for machine operation or power tools Highly polished finish High-performance alloy steel Standards: ISO 1174 and DIN 3120 Knurled for better grip when tightening with your fingers About this item 1/4" square drive socket drivers, for hex head screws Knurled for better grip when tightening with your fingers Material Not suitable for machine operation.