OTC6170 Features: -Made with superior S2 Steel to meet or exceed torque specifications.-Hundreds of applications.-All bit sockets have a 2-piece design which gives 20pct longer life than 1-piece design.-7 Piece Metric Hex Bit Socket Set. Includes: -Covered by OTC"s Lifetime Marathon Warranty7 piece set includes sizes: 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, and 10mm.. Dimensions: -Use 3/8" hex insert. Warranty: -Sets & Kits do not have warranty/ see individual pcs for details.