Herm Sprenger English Bulldog Choke Collar Stainless Steel 50906 (55) 1/10 inch (2.5 mm) - Size 18 inch (45 cm) for Dogs with Neck Size of 15-16 inch (38-40 cm) Excellent breaking load May be used for several dogs with different neck sizes Rust resistance Adjustable length Fits English Bulldog well