Set consists of: 1 x à 35 mm, 40 mm, 50 mm, 68 MMM 14 thread for use on angle grinders Long life and fast drilling progress through vacuum-soldered diamond Simple removal of the drill core through lateral cuttingsNo extra cooling required. à 6-14 mm also have an integrated paraffin emulsion for better cooling. For consecutive holes, it is recommended to cool the crown briefly with water after each hole!The thickness of the tile/porcelain stoneware/granite slab is recommended as the useful length. Usually max. 2 cm. Granite slabs / worktops can be drilled up to 5 cm. Here, the crown should be pulled out of the drill hole more often, so that it cools down briefly!important: Do not drill into the ground when the material is laid!Maximum working speed: 80 m/s.This text is machine translated.