Herm Sprenger Chrome Narrow 3mm | 51012 | Dog Check Chains | Round Narrow Links Additionally the Herm Sprenger Chrome Narrow 3mm | Check Chains | dog collars are the most popular type of link style used, especially used by not only trainers and professional dog handles but by the everyday dog owner. Suitable for small to medium dog breeds these chains are often used for dog obedience training and by the everyday dog owner. The 3.0mm gauge, Sprenger Check Chains Chrome Dog Collars are the one of our average and most popular sizes available. About each finish: In addition our Chrome Plated chains undergo first nickel, and then chromium plating to produce that strong metal shine. Note: Check chains are strong and durable, However they are not recommended for dogs that spend a lot of time in and around water, especially saltwater, or dogs that have skin sensitivity. Black Coated Stainless Steel check chains, are more expensive than Chrome plated, but the stainless steel chains are also more suited to dogs that live in coastal areas or spend time in water. Normal steel will become dull, and, especially with time spent in saltwater, will roughen the plating and become rusty. Stainless Steel also has a higher breaking load producing greater security and longer life. All Herm Sprenger Stainless Steel chains are marked with a metal label and a shiny red point with HS-GERMANY in the middle, along with HS-GERMANY INOX stamped on the rings. Link Thickness 3.0mm Chain Length 40cm, 45cm, 50cm, 55cm, 60cm, 65cm, 70cm, 75cm