Steel Sealed Spring Collets, T.I.R. 0.003 – 0.0004″,Clamping Range 0.02″ – 0.039″ by DIA. Allowable pressure: 1,500 PSI,Precision Coolant Slots,Must be used with Nominal Shank Sizes to prevent leaking, 100% Quality Control, Veteran Owned Business, 100% Customer Satisfaction Guarantee.PRECISION ACCURACY: Collet Accuracy : 0.0003″-0.0004″ T.I.RSPECIAL DESIGN: Eliminates Sealed Plugs and Coolant DiscsCOOLANT THROUGH SEALED: Manufactured with Precision Coolant Slots within collet.COOLANT PRESSURE: Allowable Max Pressure is 1500 PSI.USE OF PRODUCT5: For optimal collet performance use on size shank diameter ONLY. Non-nominal sizes will perform but you may see small amount of leaking on collet.High Quality SteelChinaManufacturer100% Guarantee to be Free from any Manufacturing Defects. 100% Customer Satisfaction Guarantee