Size of Pinch Collar:

3.25 mm, 8 links, 20 inch (51 cm)
additional link 1 2/5 inch ( 3.5 cm )
amstaff-dog-breed-info.com Introduces Herm Sprenger FORCE Prong Collar for Amstaff

STAINLESS STEEL FORCE (PINCH) Training Collar for Amstaff

First adjust the collar by removing links or adding lengths to get a “good” fit – a fit where the Amstaff will be comfortable when he is in the proper position but will become uncomfortable when he gets out of position.
If the dog is wearing a regular collar, place the prong collar in front of the regular collar and check frequently to be sure the prong collar is not hanging up on the regular collar.
I suggest keeping the pinch/prong dog collar low on the dog’s neck and walking at a slow.
After several sessions, you should be able to progress to a varied pace, and quicker and sharper turns and stops.
Placing the pinch collar higher on the dog’s neck usually causes more discomfort and a better response in dogs that have not responded after several sessions.

Also, a hs collar with smaller diameter prongs will usually elicit a better response for dogs that have been slow in responding.

General “Woof” Collar Tip: While there are so many similar collars around , we do our best to offer constantly new designs so your dog can stand out of the crowd