Micrometer Vise Head, Body Material Aluminum, Jaw Face Type Smooth, Jaw Material Nylon, Jaw Face Width 1 in, Jaw Opening - Maximum 1/2 in, Rotation Angle 360 Degrees , Throat Depth 15/16 in, Base Swivel Angle 360 Degrees , Compatible with Manufacturer Model Number 300, Features Delrin Pads Open 0.5 in (12.7mm) and Close to 0 in for Holding Thin Items, Weight: 0.23 lb (0.1Kg), Mounting Hole Diameter 5/8 in, Number of Mounting Holes 1, Overall Depth 3 1/8 in, Overall Length 3/4 in