Plastic King Size Vise is a palm vise for clamping " King Size" bracelets or cases on edge. This is a very useful tool for a surprising number of tasks. Body is made of a tough space age plastic. Block dimensions are L 50mm x W 45mm x H 35mm. Maximum jaw opening is 9.8mm. Relief slots below jaw opening to allow travel of pins when used for removing pins from bracelets. This is a Horotec Swiss product.