Features:<br> High quality, high precision<br> Strong and sturdy<br> Stable performance<br> Make you better, more efficient, more durable processing products<br> 2 In 1 Fuction: This router collet extension chuck accepts both 1/4" and 1/2" shank router bits for converting and extending<br> Specifications:<br> Shank Diameter: 1/4 Inch (6.35mm)<br> Hold Diameter: 1/4 Inch (6.35mm)<br> Chuck size: 6.35mm/ 1/4 inch<br> Chuck size: 12.7mm/ 1/2 inch<br> Package includes:<br> 1 x Router Collet Extender Holder<br> 2 x Chuck (6.35mm/ 1/4 inch; 12.7mm/ 1/2 inch)<br> 1 x ER20 M Type Wrench Spanner.<br>