Diamond Ceramic Mini Holesaws have a tough braze bonded diamond edge and durable alloy body, this gives these holesaws an extremely long lifespan. The round shank is suitable for use with cordless power drills only. Minimal water cooling is needed, simply dip in water before starting cut. Dip in water every 5 seconds during cutting for optimal life. Easy to start with no guide drill required. They will easily cut through porcelain tile, ceramic tile, granite, marble, slate, glass, cast iron, brick/block (lightweight), plasterboard, cement board, fibreglass, carbon fibre, composites and stucco.FAITDSETPRO, 4 Piece: 5, 6, 8 and 10mm. Features: Round shank for use with cordless power drills only Easy to start, with no guide drill required Easy to start, with no guide drill required Will cut: porcelain tile, ceramic tile, granite, marble, slate, glass, cast iron, brick/block (lightweight), plasterboard, cement board, fibreglass, carbon fibre, composites and stucco Set contains: 1 of each s