GREAT's High-quality Bits Series I

Normally drag bits are 3 wings, but we can make 4 or 5 wings following your drawings or samples.

This type of Bi-center bit mainly used for medium to medium hard compressive and abrasive formation.

GREAT DRILL customized Rock reamers size from 10'' to 72''.

Overview Starry Sky Roller BitGREAT has customized manufacture 90 ° U-shaped Roller Bit, 120 ° U-shaped Roller Bit and Starry Sky Roller Bit.The Roller bit mainly used for Rock reamer (Hole opener) ...