Porter Cable 42975 - 3/8 inch Router Collet. Porter Cable 42975 Use as a replacement collet or to adapt a router for use with 3/8-inch shank bits that won't fit most routers. This collet fits Porter Cable router models 690, 9690, 691, 693, 693PK, 7529, 97529, 7518, 7519, 7538, and 7539. It has an au
