Billow 20-22'' Double Layer Leather 3 Rows Bling Rhinestone Crystal Studded Pet Dog Collar There are 3 adjustment holes, please compare with below size before confirm order (please allow about 1cm measuring error) Size M: Total length 1.3"*20"(3.2*51CM), adjustable length 17.3"-19.3"(44-49CM) Size L: Total length 1.3"*22"(3.2*56CM), adjustable length 19.3"-21.3"(49-54CM) Shining Rhinstone make the collar looks more gorgeous Practical and fashionable design for your sweet pet