EXACT Countersink 90°, diameter 6.3 mm, HSS, TiAlN coating, DIN 335C. Application: for lowering and deburring, countersink range up to: 6.3 mm, total length: 45 mm, shaft diameter: 5 mm, countersink range of: 1.5 mm cylinder shaft + 3 blades. The EXACT countersink range has countersink made of HSS and HSS-E material. The Exact countersinks have a powerful U-groove that ensures fast chip removal. Furthermore, the U-groove provides a chatter-free run and a score-free sinking.