Herm Sprenger4.0mm ClicLock Fastener XL Stainless Steel Buckle for 4mm Prong Dog Training Collar with Quick Release for Extra Large Dog Collars (4mm Prongs)

This quick release clip can be put onto a prong collar - enabling easy use of the collar without using strength.

Why did you pick this product vs others?:Saw it recommended.Training tool:Easy to use with a prong collar.

Works well with our prong collar. This makes it easy for us to take the color off and on when training.I normally use this in addition to a rolled leather collar so I can take the prong off quickly with a clip when we are not training, which is easy and more comfortable for both me and the dog.I haven't had any problems with it coming unbuckled.It's durable and looks good.

Very secure lock, easy to use. Good that the lock has a sliding cover to secure the button.Take into consideration that adding the lock changed the size of the collar, and there does not seem to be a formula that brings the collar size back to what you started. The collar fit well, adding the lock made it too large (obviously). But taking 1 prong link out was not enough, 2 links out was too much. The difference was not significant enough to take a star away, just be aware.

I was able to look up the order for my dog's Herm Sprenger collar (purchased in 2021) to figure out what size I needed. The 3mm buckle works well on the 3mm collar. I assume the measurement relates to the diameter of the metal, which isn't the easiest to measure without calipers. I removed the center plate and one link, and it was a perfect match in length. As the number of links on her collar were odd, it actually helped balance the collar. I have decent hand strength for a middle-aged woman, but found it challenging to use the links on an excited dog. The buckle makes it so that my 83 year old parents with arthritis might be able to put the collar on and off without a struggle.As for the cover coming off when it is unbuckled, there is a trick that isn't obvious. One end of the slider has a little bump on the underside. That end (the skinny end) should be closest to the links when unbuckled. If you push it all the way to the links, you will feel it catch, and that will hold the slider in place, even with the collar hanging on a hook.We also use a "safety clip" from the collar ring to her flat collar, just in case something goes awry. https://www.amazon.com/dp/B08JQ3WYXC?th=1

just what i needed

An absolute MUST Purchase along with the prong collar. There is no way I would be able to squeeze the prongs together to get her collar on and off. Really happy with this - easy on, easy off - makes for an enjoyable experience when we go outside for training.

Easy to install. Fit perfectly. Strong and easy to use. Make sure to insert in the middle of the collar - same number of links on each side- so the collar does not hang off center. Perfect for what we needed and makes it much easier to put the collar on and take it off.