HS Sprenger Collar Lock Lock Training Collar Stainless Steel Lock for Dogs. This is an excellent quality necklace with rounded spikes and quick closure. Many dogs have a somewhat nervous behavior during the walk and usually pull a lot, making the walk very uncomfortable for their owner. The collar with rounded spikes prevents pulling and makes the animal act more calmly. The "Click Lock" safety closure is guaranteed and allows us to put on and remove the collar quickly, without opening the links. The collar has a central plate that distributes the pressure evenly. All products of the Sprenger brand are of superior quality and guarantee their utility for many years. The stainless steel material will make the time past us keep having the necklace as the first day. Available dimensions: 40 cm length - 1.5 cm width - 2.25 mm link thickness - Up to 20 kg 52 cm length - 2 cm width - 3.2 mm link thickness - Up to 40 kg 60 cm length - 2.2 cm width - 4 mm link thickness on - Up to 15 1.9 kg