u shaped drill bit - 2 views
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greatdrillbit on 15 Jul 20GREAT has customized manufacture several types of roller bit. It is including 90 ° U-shaped Roller Bit, 120 ° U-shaped Roller Bit and Starry Sky Roller Bit.The 90 ° U-shaped Roller Bit is straight legs of tritone bit, it is a special model made by GREAT.