Description <br> Shank Diameter: 1/4inch (6.35mm), Accept Shank Size: 1/4inch and 1/2inch Shank, Extend Length: 2-1/4inch. This router collet extension chuck accepts both 1/4inch and 1/2inch shank router bits for converting and extending. <br> Converter Adapter and ER20 Spring Collet Made of durable steel for maximum strength and long life use; ER20 M Type Collet Chuck Wrench Spanner Made of High Carbon Steel, Anti-slip handle Design, for ER20 M Lathe Clamping Nut. <br> High precision, stable performance. Extend your router bit to provide the full depth of cut, for both 1/4 inch and 1/2 inch shank router bits. <br> Eliminate the dangerous temptation of withdrawing the shank from the collet, extend the bit to provide the full depth of cut. Place the router collet extension shank in the 1/4-inch router collet and the router bit shank in the extension collet and tighten both. <br> This router collet chuck provide the additional depth of cut needed for many routing tasks. Easy to use, better to control, it will improve your work efficiency. <br> <br> Colour: silver <br> Material: carbon steel <br> <br> Package Contents: <br> 1 * 1/4inch handle extension rod <br> 1 * ER20 1/4inch collet <br> 1 * ER201/2inch collet <br> 1 * ER20M wrench <br> <br> Only the above package content, other products are not included. <br> Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm. <br>