Small fits Wilcox All-Pro Barrel Vise, Large fits many others. Accepts Brownells Barrel Vise Bushings or cast your own.
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SPECS: Steel, blue. Includes instructions. Small (Sm) - 3" wide, 3" deep, 3¼" high. Hole dia.-1¾" (4.4cm). Large (Lg) - 4½" (11.43cm) wide, 3" (7.6cm) deep, 3¼" (8.2cm) high.