NITYA 16pcs/set 6mm-50mm Diamond Coated Hole Saw Drill Bit for Stone Granite Marble Ceramic

Feature? 1.Excellent for making clean and accurate hole on glass, tile? thin ceramic ?wood or other. 2.Size?16Pcs Diamond Coated Core Hole Saw Glass Drill Bit Set?Size: 6mm/0.23", 8mm/0.31", 10mm/0.39", 12mm/0.47", 14mm/0.55", 16mm/0.62", 18mm/0.7", 20mm/0.78", 22mm/0.86", 30mm/1.17". 3.Works well with a common electric drill?Bench drill. 4.Nickel plating surface and decrease the resistance of cutting?Large cut-out for better scrap ejectment. 5.Note?Angle drill at 45 degree to start hole at low speed?then vertical position once the hole has started. Specifications: 1.Size?Hole Diameter: 6mm 8mm 10mm 12mm 14mm 16mm 18mm 20mm 22mm 25mm 28mm 30mm 35mm 40mm 45mm 50mm Usage? 1. Clean the surface and keep it wet with water& coolant.Then mark down the position of the drill hole. 2. Start drilling with a 45 degrees angle to the surface slowly. 3. Drill at low speed and adjust the drilling angle to vertical position when the hole appears. 4. Slown down to drill the hole off directly or you can exit and drill from the other side to make it smoothly. Package included: 1 x 16pcs Diamond tool drill bit hole saw set