Groz 39006 Portable Woodworking Vise, Jaw width - 6" (150 mm), Jaw Opening - 4-1/2" (112 mm) Clamps to bench top of maximum thickness of 2.25 inch Manufactured with 4 pre drilled holes to secure to work bench to enhance stability Jaws face measure 2" tall by 6" wide Max jaw opening is 5 inch Vise jaws and body made from close- grained cast iron