The Ketchum Aluminum leg band is made from a solid piece of material with an open button at one end (an integral eyelet) and a hole at the other end. The band is bent around the leg, the button fits through the hole, and with our special pliers it is rolled down making a positive seal, which cannot be picked open without detection. No. 3 adjustable is a three hole band that adapts to many breeds/species. Extra holes are cut off with scissors. 79mm (3 1/8") x 10mm (3/8"). Up to 7 characters can be stamped on the bands, with a year letter if desired. Consecutive numbering is clearly embossed. Minimum order 100.