You can use this tool set with coin ring reduction dies to fold coins with holes from 1/4" inch (0.25") to 3/4"" inch (0.75"). Included in this set: 1/4" inch hole tapered folding cone 1/2" inch hole tapered folding cone 5/8" inch hole tapered folding cone 3/4" inch hole tapered folding cone Derlin Coin Ring Folding Cone is .20 tip x 1.25 back" in diameter by 1.75" length. Derlin Coin Ring Folding Cone is meant to be used with ANY BRAND of coin ring reduction dies to begin folding coins with holes from 1/4" inch (0.25") up to 1" inch (1.0"). Designed for use in your ring sizing machine, as well as in a hydraulic press or arbor press. It is very important to make sure that your coin ring edges are deburred as well don't have any sharp edges when using these delrin folding cones. For coins that are not 99% silver, it's important to remember that Delrin cones should not be your primary folding cone. Ringers should use a steel cone for the majority of the fold and then transition to the delrin cone for the last little bit where you would get the most metal to metal contact. And remember to always anneal your coins during the folding process. WARNING! This product contains small parts and can present a choking hazard to children. KEEP AWAY FROM CHILDREN!