... .*Stronger and more rigid than conventional HSS drill bits. Crack and chip free drilling in plastic/plexiglass.*Each step is laser marked ... with the diameter.*Suitable for drilling in alloyed and non alloyed steel sheet, pipes and profiles ... 6,8,10,12,14,16,18,20,22,24,26,28,30,3215105121101606406,11,17,23,29,30,31, ... ,38,39,4016105121101206386,9,13,16,19,21,23,26,29,32,35,381210012