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50mm Bit Size & Rod Length 400mmConcrete Hole Saw is widely used for cutting clean holes in concrete, bricks and block work, drilling walls, stones, etc. Most often it is used for installation of air-conditioning.This tool easily drills through most common wall materials (brick, adobe, concrete, cement, and stone) to let you install AC tubing, water pipes, exhaust hoses, and more.Made of high-quality Carbon steel, this hole saw drill bit set will give you years of service even under extreme useComes with long SDS plus extension bar shank