This18-piece set fromProxxon Industrial includes a range ofdrivers for multi-toothed screws often used in the automotive industry, particularly in drive shafts and rear axles. ½in square drive. Set includes : 6 screwdriver bits 5mm to 14mm in standard (55mm) version; 6 screwdriver bits 6mm to 14mm in extra long (100mm) version; 6 double hexagon inserts 9mm to 21mm.