Wood Screw Set includes front and rear wood screw swivel studs. Machine Screw Set contains a machine screw front swivel stud with locknut and rear wood screw for maximum strength with wooden stocks. Both include spacers. Purchase swivel set and screw set separately.
Big Book Catalog, Issue:66, Page:240
New Product Supplement, Issue:611, Page:024
SPECS: Steel, black, matte finish. Wood Screw Set - ½” front & ¾” rear screw. Machine Screw Set - ¾” front machine screw & ¾” rear wood screw.