API Factory Single Cone Bit for Petroleum Oil Gas Well Drilling Product Description IADC Code Size Seal WOB (KN) Rotary Speed (rpm) Formation 115 2"-26" Rubber & Metal Seal 0.35-0.75 60-180 Suitable for ultra soft formation with low compressive strength and high drillability, such as clay, mudstone and chalk. 125 2"-26" Rubber & Metal Seal 0.3-0.85 60-180 Suitable for soft formation with low compressive strength and high drillability, such as mudstone, plaster, salt r