General description Router Collet Extension is designed for use with 1/4 inch, 1/2 inch, and 8mm shank bits. This tool enhances your woodworking capabilities by allowing for deeper cuts and improved efficiency in trimming, milling, and engraving tasks. Technical specifications Material: Heavy-duty steel Compatible shank sizes: 1/4 inch, 1/2 inch, 8mm Usage Ideal for woodworking trimming, milling, and engraving. Requires tightening with a wrench to secure the bit and prevent it from falling off. Other information Package includes: 1 x 1/4 Inch Router Collet Extension, 1 x 1/2 Inch Router Collet Extension, 1 x 8mm Router Collet Extension.