<b>14PCS ER20 Spring Collet Set</b><br> - Durable and practical.<br> - Special angled slots increase rigidity.<br> - Protects tool holder from contaminants.<br> - Better overall balance of tool holder assembly.<br> - Use with any standard ER collet chucks for coolant-thru tool applications.<br><br> <b>Specification</b><br> Model: ER20<br> Material:Spring Steel<br> Weight：About 567g<br> Upper Diameter: 28 mm<br> Bottom Diameter: 25 mm<br> Height: 34 mm<br> Run-Out Tolerance: <0.008mm<br> Gripping Range: 1/16"-1/2"<br> Package include: 14 x ER20 Collets<br><br>