Product selection of materials, high-quality spring steel long lastingClamping force, wide clamping range, high accuracyWide range of applications, for example, boring, milling, drilling, tapping,engraving, CNC, and other processing.Suitable For: Boring, milling, drilling, tapping, engraving, CNC, spindle machines, and other processingSpecificationsMaterial: Spring steelColor: silver graySize1/8:03cm1/4:06cm1/2:12cmHow to useInsert the tip into the pressure cap, gently turn the retainer until the pressure cap eccentric retainer portionrecessed groove along the direction of the evenly push hard retainer, you can mount the internal pressure cap.The pressure cap with retainer mounted together on a spindle or chuck body, the cylindrical afterwiping loaded clamping hole, use a wrench to tighten the pressure cap even force until the date before the folder in prison use.(Note: not in the and avoid tightening pressure cap installed to avoid damage to the retainer) with a wrench loosen pressure cap out of the chuck and the , remove the , retainer direction of the push hard to quit, and then need to put on retainer to the other aperture.Package Contents:3 x ER20 Spring ColletOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.