Attach to the edge of bench or work station. Adjusts to hold tool at proper angle. Removable insert allows holder to be adjusted to fit two different diameter tools. Hole for large tools has 1.73 in. (44 mm) diameter at top and is tapered to 1.53 in. (39 mm) at bottom. Hole for smaller tools is 1.45 in. (37 mm) at top and 0.98 in. (25 mm) at bottom. Hole depth is 2.36 in. (60 mm) for either.