Neiko 10056A XZN Triple Square Spline Bit Socket Set, S2 Steel | 10-Piece Set | Metric 4mm &ndash; 18mm A MUST-HAVE TOOL: to tighten and untighten high torque triple square screws and bolts commonly used in the alternator and pressure plate of European cars like BMW, Mercedes, VW, Audi, Porsche DURABILITY: bits made of premium S2 alloy steel for superior hardness that reduce wear-outs and insure longevity TORQUE STRENGTH: high strength chrome vanadium steel sockets provide superior torque for greater turning power with mirror chrome finish for corrosion resistance PRECISION BITS: precisely and automatically machined bit tips to ensure accurate size, chamfered bit ends insert smoothly into fasteners and protect both bits and fasteners from damaged edges ORGANIZED STORAGE: set includes a sturdy plastic organizing case for secure storage and easy carrying Set includes: 1/4 Drive: 4mm, 5mm, 6mm; 3/8 Drive: 8mm, 9mm, 10mm, 12mm, 14mm (tamper proof); 1/2 Drive: 16mm (tamper proof), 18mm (tamper proof)