【Function】This diamond countersink drill bits with 90 degrees tapered head is designed to chamfer cut, remove burrs, grinding the holes to smooth the edges.
【Wildly Use】 This countersink drill bits great be used for hard materials, such as: Glass, Marble, Ceramic, Tile, Concrete etc.
【Easy Work】The 30mm countersink bits with 5/16" shank diameter and 40/50mm countersink bits with 3/8" shank diameter suitable for most hand drill tools and easy to mount or demount, make your grinding work more efficiently.
【Material】The chamfer drill bits is made of premium steel with diamond coated, can work in wet or dry condition, remember to keep it dry after use. Can provide long service term.
【Specification】30mm Degree: 90, Shank dia x L: 5/16" x 1-1/2"; 40mm Degree: 90, Shank dia x L: 3/8" x 1-1/2"; 50mm Degree: 90, Shank dia x L: 3/8" x 1-1/2"; Grit: #150. Package: 1pack.