Precise Torque Power: Each bit is automatically machined for that precise and accurate sizing. The chamfered ends provides a smooth insertion into fasteners and protects both the bits and fastener from any damaging. Combined with the chrome vanadium steel sockets, you have great torque power that is dependable. DURABILITY: Bits made of premium S2 alloy steel for superior hardness that reduce wear-outs and insure longevity; Treated and coated to prevent corrosion; 4-point (square) drive; Recommended for use with hand tools only APPLICATIONS: Work on cars, trucks, appliances, lawn equipment, machinery, and other jobs requiring star fasteners/bolts. EASY STORAGE: Each set includes a sturdy blow molded case for convenient storage when not in use. They are embossed with the appropriate sizes so you can easily identify which socket you need. PACKAGE INCLUDES: (10) Sockets 1/4 Drive: 4mm, 5mm, 6mm; 3/8 Drive: 8mm, 9mm, 10mm, 12mm, 14mm (tamper proof); 1/2 Dri