Made of high grade close grain caste Iron. Fits our 3" (75 mm) Rotary Tables perfectly. The moving jaw has V-grooves to hold Round objects. Again these vices are drilled in a manner that these can fit to a 3 as well 4 slot table. The Drills are counter bored to ensure that the fixing screws sets perfectly ensure perfect movement. Diameter of Base : 80 mm Jaw Width : 54 mm Jaw Depth: 20 mm Jaw Opening : 32 mm Height : 29 mm