This is a great compact barrel vise that is made in the USA. It is made from 1 inch 6061 aluminum which has been powder coated to prevent slipping. It has 4 retaining bolts which is key for using on tapered Winchester barrels. It works on the round and octagon Winchester barrels. Each bolt is spring loaded making barrel insertion so much easier. This vise is great because it can be mounted to the top of your work bench or on the underside. It is small and can be taken to the gun range very easily.Each vise weighs a little over 3 pounds. Each vise comes with a set of care instructions.