Contains – D1,1.5,2,2.5,3,3.5,4,4.5,5,5.5,6,6.5,7,7.5,8,8.5,9,9.5,10,3.2,3.3,11,11.5,12,12.5,13. Faster drilling – up to 4 times faster than standard HSS-R drill bits. Increased durability – up to 50% stronger than standard HSS-R drill bits. Cleaner, accurate, burr-free holes due to recessed cutting wings. Permanent size markings located above shank for increased visibility.