| Features: Practical hole saws kit is made of high-quality diamond with diamond plating process on the edging, which has high hardness and nice cutting ability for high accuracy and smooth cutting. Wide hole design on the drill bit facilitates the entry of cooling water and the removal of chips or other particles, which ensures smooth drilling and prolongs the lifespan of the drill bit. Includes 15 different sizes of drill bits: 50mm/1.97", 40mm/1.57", 30mm/1.18", 28mm/1.10", 26mm/1.02", 25mm/0.98", 22mm/0.86", 20mm/0.78", 18mm/0.7", 16mm/0.62", 14mm/0.55", 12mm/0.47", 10mm/0.39", 8mm/0.31", 6mm/0.23". It comes with an adjustable hole saws bit guide with suction cups and 4 bearings, which | |