The two mandrels in this set allow you to size rings when wax-working or using metal clay. Each 12-1/2" mandrel securely mounts on the steel base and rotates 360 degrees. The mandrels can be removed from the stand for handheld use. This set includes: • two wood ring mandrels: one smooth, one stepped (marked from sizes 4 to 13). • one steel base, 4-1/2"L x 3-1/2"H.