Electroplated diamond coated holesaw. The diamond coated cutting edge allows precise chip-free cutting of glass, granite, marble and ceramics. With an integrated water-cooling sponge that prolongs the life of the cutting edge by reducing heat build-up. Sponge must be soaked in water before use. 22mm and 45mm cutting depth makes this range ideal for plumbing and electrical installations. Rounded 10mm hex shank means it will fit both handheld or pillar drill chucks. Electroplated diamond coated holesaw. Diamond coated cutting edge allows precise chip-free cutting of glass, granite, marble and ceramics. Integrated water-cooling sponge that prolongs the life of the cutting edge by reducing heat build-up. Sponge must be soaked in water before use. 22mm Diameter 45mm cutting depth ideal for plumbing and electrical installations. Rounded 10mm hex shank means it will fit both handheld or pillar drill chucks. Model No. DHS22 DURABLE - Electroplated diamond coated cutting edge allows precise chip-free cutting of glass, granite, marble and ceramics. COOLING - soaked sponge prolongs life of cutting edge by reducing heat build up. DIVERSE - 45mm cutting depth makes this range ideal for plumbing and electrical installations. DOMESTIC OR PROFESSIONAL - rounded hex shank means it will fit both handheld or pillar drill chucks.