Quality: These drill bits are made from high speed steels and are available in 6 different diameters of 1/4'', 5/16'', 3/8'', 1/2'', 5/8 '', 3/4 ''. NOTE: We have our own factory to produce this drill bit and can offer the best and quick response to any problem or question you meet. Perfect Design: Five blade chamfering with a groove, easier to discharge debris, and the high carbon steel drill bit is not easy to blunt. 1/4" hex shank cutters are suitable for speed drill and will not slip in chucks. eliminates burrs and vibrations: All have 90 angles on the precise and precise milling point. The cutting edge is honed and hardened for sharpness. A five-tooth burr-free design with staggered cutting teeth contributes to free chip flow and fast chatter free cut. Widely Application: Ideal for wood openings, reaming, chamfering and so on. Also applies to wooden planks, MDF, plywood, fiberboard, acrylic, PVC board and soft metal such as aluminum, copper and so on. Warm Tips: You can easily make deep countersinks by adjusting the depth stop of the countersink to allow the countersink to drill deeper into the work surface. Remember to measure your cork size to make sure your strawberry's body firstly if you need any help during the operation, we will offer the help at the earliest time.