Premium 1-1/4 UNC diamond coring drill bits engineered for extreme durability in reinforced concrete and brick with embedded steel bars. Industrial-grade diamond segments bonded with high-grade steel for superior cutting precision and extended lifespan. Heat-treated alloy steel body prevents bending or cracking under high-torque applications. Precision laser-welded segments ensure stable performance during continuous dry/wet drilling. Ideal for professional construction, plumbing, and electrical installations through rebar-rich structures. Mirror-polished flutes minimize friction for faster penetration and cleaner holes. Backed by bulk pricing advantages exclusively for wholesale buyers.