The NCK series jaws are designed for BMWOOD NCK series chucks NCK-3., 75ZN, NCK-G3., 75, NCK-4M and also compatible with the chucks: SuperNOVA2, G3 Nova, Robert Sorby Patriot, Record Power SC3, Record Power SC4., Designed for use with dovetail jaws, this faceplate ring provides a secure attachment to bowl blanks, eliminating the need for separate faceplates. 2 Round jawsIt can hold much larger workpieces and has ridges that press into the wood for a better grip.No. BMWOOD NCK-3.75Z-FP Face Plate Ring For BMWOOD NCK Series Woodturning Feature 3: Aluminum caseProtective aluminum case makes for easy storage and transportation. No. Excellent concentricity, minimising vibration for a chatter-free, super fine finish. Expand dovetail jaws to grip into the machined dovetail groove in the rear of the ring Easy to use, simply screw the ring to your bowl blank using woodscrews Excellent concentricity, minimising vibration for a chatter-free, super fine finish. Axminster Woodturning Dovetail Jaws Type F Axminster Tools International Securely attach bowl blanks, eliminating the need for separate faceplates. Refer to the illustration in the manual for closing the round jaws around the base of the screw. Small round jaw with outside grip range from 1-1/4 to 2-1/2" and inside grip range from 1-3/4 to 3-1/8" ; Big round jaw with outside grip range from 3 to 4-1/4" and inside grip range from 3-1/2 to 4-7/8" ; Pin jaw with outside grip range from 3/8 to 1-3/4" and inside grip range from 1 to 2-3/8"; Step jaw with outside grip range from 3/32 to 1-3/8" and inside grip range from 3/4 to 2" at upper step and 1-1/2 to 2-7/8" at lower step; Flat Jaws with max outside dia. BMWOOD NCK-3.75Z-FP Face Plate Ring for Woodturning Lathe Chuck... 1 Round Jaws capacity:Outside Grip Range: 1 1⁄4"–2 1⁄2"Inside Grip Range: 1 3⁄4"–3 1⁄8"No. The tightening mechanism provides additional grip strength to the workpiece. The surfaces of the jaws have ridges that push into the wood which increases the gripping power.