High-quality diamond hole saw set! Includes 8 diamond hole saws (6-68mm) and 2 diamond discs 125mm. Technical specs: hole saw diameters: 6,8,10,25,30,35,50,68mm; disc size: 125x10x22.23mm (2 pcs); M14 thread; diamond layer height: 10mm; hole saw cutting depth: 3.5cm; vacuum brazed diamond tech; max speed: 11,000 rpm; capacity: ~40-80 holes depending on material and technique.