R8 Precision Round Spring Collet, R8 Collet, Precision R8 Collet Set, 20mm Mill Chuck Holder, 65Mn Spring Steel, 7/16-20UNF Thread, Taper Spindle R8 Collets for Mill Machine, 1 Pcs, (Bettomshin)

R8 Collets do not collapse.

The Tail Thread Is 7/16-20UNF; Tooth Type: Fine Teeth; Precision: 0.013mm; Hardness(HRC): HRC55; Clamping Range (Inner Diameter): 20mm / 0.79-inch.

Using high quality 65Mn alloy steel, hardened, long life and more durable.

Precision ground to close tolerance.

Positioning slot make the collets more quickly and convently to install.

Large clamping force, wide glamping range, not aasy to wear, strong and durable.

Surface grinding to ensure tolerance and accuracy, strong versatility and reliable.