Description:</b><br>Suitable For: Boring, milling, drilling, tapping, engraving, CNC, spindle machines, and other processing<br>14 x ER20 Spring Collets<br>14PCS ER20 Spring Collet Set： Model: ER20<br> Precision:<0.015<br> Material:Spring Steel<br> Ground roughness is Ra0.4 Microns, plus overall fine polish<br> Gripping Range: 1/16",3/32",1/8",5/32",3/16",7/32"1/4",9/32",5/16",11/32",3/8",13/32",7/16",1/2"<br> Upper Diameter: 28 mm<br> Bottom Diameter: 25 mm<br> Height: 34 mm<br> T.I.R.: 0.0003" or 5um.<br> <br>Features:<br> 1.Durable and practical.<br> 2.Special angled slots increase rigidity.<br> 3.Protects tool holder from contaminants.<br> 4.Better overall balance of tool holder assembly.<br> 5.Use with any standard ER collet chucks for coolant-thru tool applications.<br> Note:<br> Manual measuring, please allow 1 ~ 2 cm error,thank you.<br>