"B"-size rings are the second smallest size in the A-F range. For use with mouldings with a width of 5/8 to 1 inch. Distance between points is 3/4 inch. Miter Clamp Pliers (sold separately) are required to apply and remove these rings. Useful for clamping and glueing crown moulding, base trim, chair rail, picture frames, cabinets, etc. The application tool allows for precise alignment and clamping of all sizes of miter joints. The clamp rings are available in six sizes A-F as well as a "pinch clamp" for smaller work. Search "Ulmia Clamp" to see all of the different sizes.