... time Type6"(152mm), 6 1/2"(165mm), 8 1/2"(215.9mm), 9 1/2"(241.3mm), 12 1/4"( ... ) , 14 5/8"(371mm), 15"(381mm), 17 1/2"(445mm), 24"(609mm), 26"(660mm)IADC 147,437,447,517 ... 516 526 537 547 516 536 535available sizes:From 2 7/8 to 26”larger sizes for hole opener ... features)Button bit,saw teeth1) Y-Conical teeth 2) X-chisel teeth3)K- wide teeth4)G- Gague protectionMaterialAlloy steel ,carbidePackingWooden ...