Gearwrench® 12Pc 3 8in. Drive Metric Hex Bit Socket Set Plastic Lids Header wrap is designed to Combination Wrenches Header wrap is designed to retain heat inside your exhaust to improve efficiency and performance Ratcheting wrench insert bits are designed to give access to fasteners in really tight spaces Can be inserted into the box end of a wrench and act like a low profile bit socket Fits in 8mm 12mm or 15mm 6 or 12 point wrenches or ratcheting wrenches Narrower profile when used in a ratcheting wrench than standard ratchets Zinc phosphate coating for corrosion resistance Ball detent securely holds the insert bit in the wrench Bit material – S2 steel Piece count – 12