The Porter-Cable 42950 is a 1/2 inch collet. The collet is for use with the Porter-Cable routers. The collet fits Porter-Cable router models 690, 690LR, 9690LR, 691, 693, 890, 891, 892, 7518, 7519, 7536, 7537, 7538, 7539. It has an auto-release design which keeps the collet captive in the collet nut so the collet is automatically released from the arbor as the collet nut is loosened.
1/2 inch Collet Assembly
Used with Models 690, 9690, 691, 693, 890-893, 7518-7519, 7536-7539
Auto-release design prevents "frozen" bits