Wheeler Engineering 89-Piece Deluxe Gunsmithing Screwdriver Set with Durable Construction and Storage Case for Gunsmithing and Maintenance EASE OF USE: Hollow-ground bits have a concave shape that allows for insertion all the way into the screw slot for maximum contact VERSATILITY: Features (54) hollow-ground flat bits, (15) specialty bits, (8) Allen, (4) Phillips, (3) Torx, (1) 2  shaft extension and (1) hex-to-square drive adapter INCLUDES: 2 non-slip, overmolded plastic handles with a convenient hinged storage case DURABLE: Constructed of strong, S2 tool steel