This Kobalt 100-piece ultimate screwdriver bit set includes the most popular screwdriver bit sizes. Twelve (12) different style tips to cover most jobs. Includes hard to find security style bits. Made of durable S2 steel for long life. S2 Chrome Vanadium Steel Rockwell hardness of 58 - 62 Hard case to keep the bits organized Contains three (3) each: PH0, PH1, PH2, PH3, SL6-8 Contains two (2) each: PZ0, PZ1, PZ2, PZ3, SL3-4, SL8-10, SL10-12 Contains one (1) each: H1.5, H2, H2.5, H3, H4, H5, H5.5, H6, H8, H1/16-IN, H5/64-IN, H3/32-IN, H7/64-IN, H1/8-IN, H9/64-IN, H5/32-IN, H 3/16-IN, H7/32-IN, H1/4-IN Contains one (1) each: T8, T10, T15, T20, T25, T27, T30, T40, T45 Contains one (1) each: Clutch 1, 2, 3, Cross X6, X8, X10, Spline 5, 6, 7, and Y Tip Y1, Y2, Y3, Y4 Contains one (1) each: 1/4-IN x 1/4-IN Socket Adaptor, 1/4-IN x 1/4-IN Bit Adaptor and 2.5-IN Magnetic Bit Holder Series Name: N/A Sub-Brand: N/A Type: Screwdriver Bit Length: 1-in Bit Size: Set Shank Size: 1/4-in Case Type: Hard Coating: Uncoated steel Double-Ended: No Head Type: Set Material: Steel Package Quantity: 100 Set/Individual: Set Shank Type: Hex Brand/Model Compatibility: N/A Warranty: Lifetime CA Residents: Prop 65 Warning(s): Yes UNSPSC: 20121600