Amana Tool D 1 4 Inch O Flute Upcut Spiral Router Bit for Aluminum with Zirconium Nitride Coating 51402 Z OF 2200 Accessories and treated with linseed oil and treated with linseed oil The magnetic adapter holds 1 4 inch hex screwdriver bits Ideal for industrial applications our spiral ‘O’ flute router bits are manufactured using innovative techniques and materials that yield superior results with each cut and help make aluminum projects less labor intensive Amana Tool D 1 4 Inch O Flute Upcut Spiral Router Bit for Aluminum with Zirconium Nitride Coating is to be used only on CNC machines and routers with automatic feeding