Description:14pcs ER20 1/16 Inch to 1/2 Inch Spring Collets Set For CNC Engraving Milling Lathe Tool Specification:

Model	ER20
Material	Spring Steel
Precision	<0.015
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"
Upper Diameter	28 mm
Bottom Diameter	25 mm
Height	34 mm
T.I.R.	0.0003" or 5um.

 Suitable For: Boring、 milling、 drilling、 tapping、 engraving、 CNC、 spindle machines、 and other processingGround roughness is Ra0.4 Microns、 plus overall fine polish.
 Quantity: 14pcs / Set Features:1.Durable and practical.2.Special angled slots increase rigidity.3.Protects tool holder from contaminants.4.Better overall balance of tool holder assembly.5.Use with any standard ER collet chucks for coolant-thru tool applications. Package Included:14 x ER20 Collets Note:Manual measuring、 please allow 1 ~ 2 cm error、thank you.
In order to make all collets running true、 on your side、 make sure your machine spindle and chuck holder running true; on my side、 I'll make sure all those collets running in tenth. More Details: