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391As one of the reaming drilling tools, the mushroom type column tooth drill bit is often used when the drill bit needs to be enlarged after the pilot drill bit is drilled to a specified depth. Thread model：R28，SSR28，R32，SSR32，R35，SSR35,R38，T38，T45ï
As one of the reaming drilling tools, the mushroom type column tooth drill bit is often used when the drill bit needs to be enlarged after the pilot drill bit is drilled to a specified depth.
Thread model：R28，SSR28，R32，SSR32，R35，SSR35,R38，T38，T45，T51
Drill diameter：76mm ~ 152mm
