Review on 20 Pack of Black Plastic Rope Clamps by West Coast Paracord - Ideal for Making Leads, Lines, Lunge Lines, Cross Ties, and More (8mm - 10mm) by Robin Naber

This is a joke. Sure, they look great when attached, but it will straighten the end of your rope! They are absolutely useless, there are no "teeth" inside to grab or attach two pieces of rope. You still need to merge two ropes (the knot will not fit inside). I ended up using hot melt glue, but this method is messy. I would not use on a leash, they are untrustworthy! I made some mooring lines for my kayak, something different, tie your lines a little tighter some other way.