Wheeler Pro Screwdriver 89 Piece Set - Screwdrivers are the most important and most-used gunsmithing tools. Wheeler's Deluxe Gunsmithing Screwdriver Set is the kit that belongs on every gunsmithing bench - the well thought-out bit selection will put an end to burred, buggered, busted up screw slots on any gun that comes your way. The bits make up the heart of any screwdriver set, and Wheeler's are the finest available. They're made from S2 tool steel and hardened to 56-58 Rockwell C". Case Size: 8" x 12" x 3"Bit Material: S2 Tool SteelBit Hardness: 56-58 Rockwell CDriver Handles: 2, with magnetsExtension: 1, 3" with magnetAdapter: 1 Hex to square driveFlat Bits: 54 Hollow-GroundAllen Bits: 8Phillips Bits: 4Torx Bits: 3Specialty Bits: 15