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The Porter-Cable 42999 is a 1/4 inch self releasing collet for models 690 and 7519. The collet is required in order to use smaller, 1/4 inch shank bits with the routers. The auto-release design prevents bits from becoming frozen or stuck. The collet and collet locking nut, are one unit, which helps prevent loss.
1/2 inch Collet AssemblyFor use with the Porter-Cable routers
1/4 inch Self Releasing Collet
Holding, gripping and fastening