8 1/2"China tungsten carbide insert bit

carbide Insert Tooth,Tri-cone rock Bits, TCI bit, button bit , rock bit 1. Sizes range from 3 7/8" to 26". 2. Covers almost all IADC code. 3. Optimized sealed bearing and lubrication system. 4. Used for mining, hydrology, subterranean heat piling, water well drilling and oil well drilling. 5. Our products have reliable quality and competitive price. If you are interested in our company, please leave a message to us, we will reply you soon. 2,We are a professional company in