4Pcs Top And Bottom Bearing Flush Trim Router Bits Set 1/4 Inch Shank, Carbide ?Size?Flush trim router bit with 1/4Inch shank, Carbide blade cutting height 3/4",1",1-1/4",1-1/2". Perfect for trimming veneer, laminate and shelf edges to achieve a smooth, beautiful finish. ?Top Quality?Made from top YG6 tungsten carbide blades, solid hardened steel body with clever anti-kickback design,top grade ball bearing guides ensure smooth operation of the cutter for sharp and long-lasting cutting; ?Wide Applications?This professional Top and Bottom flush cut trim router bit is suitable for hardwood, softwood, MDF, chipboard, plywood, acrylic and various wood composites (Avoid cutting metal and non-wood materials such as steel, iron and sand). ?Applicable equipment?Use on CNC and other automatic routers, as well as portable and table-mounted routers, such as Bakelite milling machine, engraving machine, deburring machine, table router, hanger milling machine, etc. ?Safety Instructions?The universal 1/4Inch round shank provide greater stability and less vibration during use.Note: When installing on the electric drill, please try to clamp the handle of the Roundover Router Bit to the "K" line(as shown in picture 6), otherwise it will be easy to bend the shank.