Neiko 10078A XZN Triple Square Spline Bit 12 Point Set, CrV Steel, 11 Piece | Metric Industrial grade chrome vanadium alloy steel provides superior hardness that reduce wear-outs and insure longevity Precisely machined 12-points security bit ends insert smoothly into fasteners and protect from damaged edges and ensures accurate size Specialized bit set is ideal for German cars, sockets work with both an impact drill and breaker bar to loosen stubborn of bolts 11 piece adapter set comes in a variety of sizes for multiple application; 1/2" x 10mm, 10mm hex shank, 75mm: m5, m6, m8, m10, m12; 30mm: m5, m6, m8, m10, m12 Top quality, hard plastic carrying kit is portable and conveniently packs all bits for simple storage and organization