Adjustable Leather K9 Collar | D-ring and Buckle | Durable and Sturdy A classic leather collar durable and sturdy approximately 1/8" thick secured with rivets with brass-plated steel D-ring and buckle. Each collar has 5 holes set 1" apart for a proper fit.,Adjustable Leather K9 Collar | D-ring and Buckle | Durable and Sturdy A classic leather collar