Dogs Kingdom 20"-22" Spiked Studded Dog Collars Small Medium Dogs Pitbull Terrier Collar Strong and durable PU leather Medium:1.3*20''(3.5*51cm);Suitable for neck size:16-18'' Large:1.3*22''(3.5*56cm);Suitable for neck size:18-20'' 5 holes for adjustment Kindly please confirm the neck size for your pet before your order.