This 15 piece drill bit set by bosch is ideal for your drilling needs it contains a great selection of the most common diameters of metal wood and masonry drill bits with this variety of drill bits you are always prepared for your drilling project the bits come in a handy carry case 15 drill pieces includes the set includes 15 drill pieces 5 masonry drill bits 3 mm 4mm 5mm 6mm 8 mm note masonry drill bits only to be used by drills with a hammer function 5 metal drill bits 3 mm