The 4 blade thickness is equally criss-cross shape to prevent annoying cam-outs and provide powerful torque transmission; For screw tightening; Blade edge: PZ2; Shaft length: 3.9 inches (100 mm); Total length: 8.0 inches (204 mm); Shaft diameter: 0.2 inches (6 mm); Grip diameter: 1.2 inches (31 mm); Full body hardening; Tip: Magneted; Shaft diameter: Magnet; Grip: Polypropylene.