11Pcs Higher Quality Diamond Hole Saw Drill Bits Set, 10Pcs Drill Bits & 2" Chamfer Milling Bit, Trangle Shank Thread, Tools, Tool Box,Drill Bit Set,

[Package Content]11pcs/box: 10pcs drill bits with Trangle Shank:Diameter 1/4" 5/16" 3/8" 4/5" 1" 1-1/8" 1-1/4" 1-3/8" 1-4/5" 2-1/2"(6/8/10/20/25/28/32/35/45/65mm),1pc 2"(50mm) Chamfer Milling Bit with HEX Shank,In a Useful Box to Keep them Together and Easy to Find.[High Durable & Efficiency] High-quality diamond grains and vacuum brazed technology provides high efficient working performance/Faster Drilling Speed/Longer Service Life.Treated by special high-temperature resistant process,can be used directly dry drilling,also with water to extend service life.[High Precision & Clean Cuts] U-Grooves design fast chip removal,high-temperature resistant process allowing for greater accuracy in drilling and englarge/beveling/shaping existing holes.[More Versatility & Convenience] Shape existing holes from 0 to 50mm With a diamond drill bit set,you have a Range of sizes and types to tackle different projects and materials,save money.[Recommended Machine] Recommended Speed 6000RPM;Triangle Adapter for electric drill,recommended speed 2000-5000RPM;Faster the RPM, longer the bit's working life;Hammer drill,you can use SDS Adapter but have to shut down hommer moder when using these bits;