DescriptionUsage : Home DIYMaterial : High Carbon Steelis_customized : NoType : Hand Tool PartsOrigin : Mainland ChinaSize:5Pcs:6 /8/10/12/15mm5Pcs:16/18/20/22/30mm10Pcs:6/8/10/12/15/16/18/20/22/30mm16Pcs:6 /8/10/12/14/16/18/20/22/25/28/30/35/40/45/50mm30Pcs:6/8/10/12/14/16/18/20/22/25/26/28/30/40/45/50mm+14*6mmPackage Includes5/10/16/30pcs Diamond Coated Hole Saw Drill BitsUsage:The product is installed on a professional drill or electric drill,bench drill. Rpm 800-1000 rpm or so,you must add water cooling holes during operation.apply to job openings fast glass, plastic sheeting, wood and other products.Note1 After opening installation, commissioning idling should observe whether the beating,then normal operation, the best results2 Into the hole to have a smooth time,please do not exert pressure on the side and curves spud3 Have enough openings for cooling and lubrication to reduce wear and coating products off4 Non-occurrence of high-temperature drilling dry rub,causing severe wear affect the results5 The operator must wear safety protective equipment to ensure safe operation