This Universal mixed drill bits set comes with 40 pieces and can be used with wood, metal, plastic, brick and concrete block Universal Mixed Drill Bit Set includes 9x Metal drill bits (2, 2.5, 3, 3.5, 4, 4.5, 5, 5.5 and 6mm), 3x masonry drill bits (5, 6 and 8mm), 5x brad wood drill bits (3, 4, 5, 6 and 8mm), 15x 25mm driver bits (PZ1, PZ2, PZ3, PH1, PH2, PH3, SL5, SL6, T10, T15, T20, T25, T27, T30 and T40), 6x 50mm driver bits (PZ1, PZ2, PH1, PH2, SL4 and SL6), 60mm magnetic bit holder, drill diameter gauge and plastic carry case Universal Mixed Drill Bit Set is a great mixed drilling set for various drilling applications Drill Bit Set coems in a handy carry case for easy storage Mixed Drill Bit Set has a straight shank for quick release