Initial Drill for Re-Entry - This 14 7/8 inch four roller cone tungsten carbide insert roller bit is used to drill the initial hole after the re-entry cone has been landed on
Welcome to Austins Foundry - Timaru, New Zealand
Review: 4AG Titan 6300 roller drill
Southern Cultivation Services - Roller Drilling
Tricone Roller Cone Drilling Bit Button , 12" | eBay