Made to meet the needs of carpenters,furniture restorers, boat builders, wood carvers and others with tricky clamping needs. It is ideal for securing mitered picture frames, crown moldings, corner baseboards, door and window casingsand other finished carpentry needs. The kit includes the mitre clamp tool and is packaged with the most commonly used ring sizes. Kit comes with clamp tool and four each high strength sprrng steel B and D rings. With these two ring sizes molding widths from 5/8" to 1-3/4" can be clamped.