The irw1840635 12 piece irwin masonry drill bit set consisting of the following sizes30 x 70mm 40 x 80mm 50 x 90mm 55 x 95mm x2 60 x 100mm x2 65 x 115mm 70 x 110mm x2 80 x 120mm and 100 x 140mm the bits have an improved tip design which ensures 20 more life compared to the previous version a single flute design provides maximal space for dust removal and the aggressive head shape guarantees faster drilling supplied in a high quality durable hard case