This Carbide Tipped Router Bits designed to cut deep or shallow round grooves, also for round bottom；It is used to widely cut round diameter from 1/4-inch to 2-1/2-inch with 1/4-inch and 1/2-inch shank; Made with premium carbide tipped router bits cut all wood composition materials smoothly and it also good for other materials such as aluminum panel，drywall, Bakelite, acrylic, plastics etc.; Application of High-strength steel is helpful to prevent breakage of the handle.