PORTER-CABLE 42999 1/4-Inch Self Releasing Collet This is an O.E.M. authorized part Fits various PORTER CABLE models OEM Part Number 42999 Replacement Collet for 690 and 890 Series Routers For use with 1/4-inch Shank Router Bits Helps decrease the amount of lost bits Dimensions: 6.0 by 3.0 by 1.0 inches (WxHxD); weighs 2.4 ounces Compatible with these Porter Cable Routers: 690, 691, 692, 7518, 7519, 7529, 7537, 7538, and 7539