This Universal mixed drill bits set comes with 302 pieces and can be used with wood, metal, plastic, brick and concrete block Universal Mixed Drill Bit Set comes with 25x metal drill bits: 2x (1, 1.5, 2, 2.5 3, 3.2 3.5 and 4mm), 1x (4.5, 4.8, 5, 5.5, 6, 6.5, 7, 8 and 10mm), 10x wood drill bits (3, 4, 5, 2x6, 7, 2x8, 9 and 10mm), 10x masonry drill bits (3, 4, 5, 2x6, 7, 2x8, 9 and 10mm) and 4x flat wood bits (16, 18, 20 and 22mm), 8x hex keys (1.5, 2, 2.5, 3, 4, 5, 5.5 and 6mm), 10x nut drivers (4, 5, 5.5, 6, 7, 8, 9, 10, 11 and 12mm), 160x 25mm driver bits (10xPZ1, 15xPZ2, 5xPZ3, 5xPH0, 10xPH1, 15xPH2, 5xPH3, 3xSL3, 5xSL4, 5xSL5, 5xSL6, 5xH2, 5XH2.5, 5xH3, 5xH4, 5xH5, 5xH6, 5xT10, 5xT15, 5xT20, 5xT25, 5xT27, 2xT30, 5xS0, 5xS1, 5xS2, 5xS3), 36x 50mm driver bits (2xPZ1, 5xPZ2, 3xPZ3, 2xPH1, 5xPH2, 3xPH3, SL3, SL4, SL5, SL6, T10,T15, T20, T25, T27, T30, H2, H2.5, H3, H4, H5, H6), 8x 50mm double ended driver bits (PH2/SL4, PH2/SL6, PZ2/SL4, PZ2/SL6, PZ1/PH2, PZ2/PH1, PZ2/PH2, PZ3/PH3) 4x Holesaws, 4x drill depth stops, 4x screw starters, 1x retractable knife, 10x knife blades, 1x holesaw arbor, 1x ratchet handle, 1x quick-change bit holder, 1x magnetic bit holder, 1x drill guide, 1x countersink, 1x torpedo level, 1x metal ruler and a blow moulded case Carbide tip minimizes wear and increases durability 135 degree split point tip for metal drills is recommended for cooler operations and will stay sharper for long Hard case of the set provides secured storage and organization Magnetic universal holder for fast bit changes and a reliable screw hold in the bit. Set features 4241 roll forged metal drills, 40Cr with YG8 masonry drills, CRV6150 screwdriver bits. Straight shank