Porter Cable 42999 Use 1/4-inch shank router bits with your 3-1/4-hp Porter-Cable router or just replace a lost collet with this 1/4-inch auto-release collet. Router models, no. 7518, 7519, 7538, and 7539, come standard with only a 1/2-inch collet, since

Tools & Hardware:  Converts 1/2-inch to 1/4-inch, Use for replacement, One unit assembly, Auto-release design
Company: Porter-Cable 
List Price: $14.40
Amazon Price: $8.36

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