EZ Change Flush Trim Router Bit System (Replaces Ocemco #TA-150) Quickly& easily change cutters without removing arbor from the router! Carbide tipped cutters are mounted on alloy steel arbors with hex driveto eliminate slipping. Save money by replacing only the cutters whenthe knives become dull, instead of replacing the entire tool. #47170 is a fully assembled flush trim router bit, complete with shank, 2-flute carbide tipped cutter, bearing & screw. Flush trim router bit #47170 replaces Ocemco #TA-150. 3-pack of carbide tipped cutters #55170 replaces Ocemco #TA-156.