A check chain is an excellent training tool. It does not harm the dog in any way when used correctly. A check chain works on a jerk and release motion and distributes pressure equally around the neck region. Pet One Check Chain’s are made with Durable high quality chrome plated steel and comes in many different sizes to suit your dog.
 
Available in different sizes:
49585 -  2 mm (W) 30 cm (L)
49586 - 2 mm (W) 35 cm (L)
49587 - 2 mm (W) 40 cm (L)
49589 - 2.5 mm (W) 40 cm (L)
49590 - 2.5 mm (W) 45 cm (L)
49591 - 2.5 mm (W) 50 cm (L)
49592 - 2.5 mm (W) 55 cm (L)
49593 - 3 mm (W) 55 cm (L)
49594 - 3 mm (W) 60 cm (L)
49595 - 3 mm (W) 65 cm (L)
49596 - 4 mm (W) 65 cm (L)
49597 - 4 mm (W) 70 cm (L)
49598 - 4 mm (W) 75 cm (L)