... Elastomer sealed,have new and old in stock.export to many countries,have a good feedback. 1. Metal-face sealed bearing Tricone ... Structure The durability of premium tungsten carbide insert is improved with new formulas and new techniques and new techniques. Gauge Structure ... /8",4",4 1/2",4 5/8",4 3/4",6",6 1/2",7 1/2",8 1/2",9 1/2",9 5/8",9 7/8",12 1/4",15",15 1/2",17 1/2", etc ...