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Item No. Diameter Work Length (mm) Thread(mm) Segment Height (mm) ZDT025 1"(25mm） 150 M16 10 ZDT032 1-1/4"(32mm） 150 M16 10 ZDT038 1-1/2"(38mm） 150 M16 10 ZDT052 2"(52mm） 150 M16 10 ZDT056 2-1/4"（56mm） 150 M16 10 ZDT076 3"(76mm） 150 M16 10 ZDT089 3-1/2"（89mm） 150 M16 10 ZDT102 4"(102mm） 150 M16 10 ZDT127 5"(127mm) 150 M16 10 ZDT152 6"(152mm) 150 M16 10 Features:  Fast, smoothly and long life drilling. Applications: Designed for dry drilling brick,block and abrasive concrete by handheld core drill or stand core drill. Working Condition: Dry