R32 45mm Threaded Button Bit for Rock Drilling The R32 45mm threaded button bit is a top hammer rock drilling tool engineered for high-efficiency drifting, tunneling and underground bench drilling. Manufactured from high-grade alloy steel with ultra-wear-resistant tungsten carbide inserts, this 45mm drill bit delivers efficient impact energy transfer, fast penetration rates and an extended service life in medium to hard rock formations. Product Overview Designed with a flat