About This ✅This set of Wide Jaws is Dedicated for VINWOX 3.75" SCK4-3.75 & 4" SCR4-4 4-Jaw Self-Centering Wood Lathe Chuck, Same Jaw Fixing System Across PSI “C” Series and Craft Supplies 3.75” Apprentice Chuck – TOTAL INTERCHANGEABILITY! (Won't Fit to Nova, Record Power, Vicmark & Oneway Chucks) MAKE SURE TO CHECK YOUR LATHE CHUCK FIT FIRST to Avoid Unfitting or Return. ✅One of the Most Popular Accessory for Mounting 10” to 14” Bowls with Minimal Damage ✅Ideal Gripping in the Expansion and Contraction Mode for Footed Bowls, Plates, etc ✅Designed for Optimum Gripping Base of Larger Bowls/Plates Exterior 4” and Interior 3-1/2” ✅Wide Jaw Specification: Outer diameter 4", Weight 1.0 LB (0.44 Kg), with 8 Mounting Screws Overview Brand : VINWOX Material : Alloy Steel Item Diameter : 4 Inches Item Weight : 0.49 Kilograms Compatible Devices : Lathe