Excellet 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 quickest response to any problem or question you meet. Perfect Design: Five-blade chamfering with one groove, easier to discharge debris, and the high carbon steel bit is not easy to dull. 1/4 ' hex shank cutters are suitable for a drill press fast and will not slip in the chucks. Eliminate burrs and vibrations: All have 90 ° angles on the precise and precise milling point. The cutting edge is sharp and hardened for sharpness. A five-tooth burr-free design with offset cutting teeth contributing to free chip flow and fast free-cutting chatter. 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 milling cutter to allow the milling cutter to drill deeper into the work surface.