<p><strong>Specifications:</strong></p><p>Collet Material: High-quality Alloy Spring Steel Material</p><p>Wrench Spanner: High Carbon Steel; Anti-slip handle Design</p><p>Shank Diameter: 1/4'' Inch (6.35mm);  1/8'' (3.175mm)</p><p> </p><p><strong>Package List:</strong></p><p>1 x ER11-M 1/8' Collet (3.175mm)</p><p>1 x ER16-M 1/4'' Collet (6.35mm)</p><p>1 x ER20-M 1/4'' Collet (6.35mm)</p><p>1 x ER11-M Collet Clamping Nut</p><p>1 x ER16-M Collet Clamping Nut</p><p>1 x ER20-M Collet Clamping Nut</p><p>1 x ER11-M Type Collet Chuck Wrench</p><p>1 x ER16-M Type Collet Chuck Wrench</p><p>1 x ER20-M Type Collet Chuck Wrench</p>