... reputations for providing quality products and best service. 2.Specifications about our productsAbout the tricone bit tricone ... of bit ensure very high penetration rate .To secure the bit from diameter loss, the gage protection ... Available Size: 6",6 1/2",7 1/2",8 1/2",9 1/2",9 5/8",9 7/ ... 8",6",6 1/2",7 1/2",7 7/8",8 1/2",9 1/2",9 5/8", ... decibels. Main Type Available Size: 8 1/2",9 1/2",9 5/8",9 7/8",10 ...