Check the listing for details. Big Horn Router Collet -1/4"- Porter Cable Style. Condition: New. Listed at 27.48 USD. Big Horn Router Collet -1/4"- Porter Cable Style, 181064, AFTERMARKET REPLACEMENT FOR the Porter-Cable 42999 - designed for use with the 7518, 7529, 690 and 890 series of Porter-Cable Routers, FOR USE WITH 1/4" shank router bits - Collet Nut Threads: 20 TPI, DESIGNED TO MINIMIZE BIT run-out and enhanced robustness, ROUTER COLLET DESIGN HELPS decrease the number of lost bits, The Big Horn 1/4" Router Collet is an aftermarket replacement for the Porter-Cable 42999. This router collet is designed for use with the 7518, 7529, 690 and 890 series of Porter-Cable Routers. Its clever design allows the router bit, collet, and collet nut to be removed as a single, unified unit, which helps prevent lost bits and aids in removal of stuck or immovable bits that won’t budge. It is also.