Center Rock manufacturers a full line of air rock drilling tools and accessories including our DTH hammers and bits from 3.5″ to 48″ diameter, casing advancing under reaming systems, and are a leading global manufacturer/supplier of the CRI Standard, Reverse Circulation, HDD and Utility multi-hammer LP Canister drills. Coupled with outstanding service, CRI is a one stop rock drilling shop capable of supplying the tools for your rock drilling requirements.