This invaluable tool helps remove dents from a damaged filter ring on a camera lens. Just fit the tool inside a dented filter ring, and screw it out. The bent edges come right out with no mess, no fuss, and no scratches. It can also be used as a hand-held vise for very small objects. This Lens Vise is very easy to use. It works on lenses, filters with thread size 28mm to 85mm. Simply rotate the stick on the top of it clockwise to close down the vise. Put it on your lens and then slowly rotates the stick anti-clockwise to open it. Once the vise is opened and firmly grips your lens rotate the vise out to remove any dents. Use small side grip for smaller diameters, use flip side for larger diameters.