Yep, the info on the sight says they're .019 pins, but looking at the pics it doesn't look like the end of the fibers are melted. This makes them too small. It may help if you can melt them. If you can push the fibers out of the end of the pin housing about 1/32". Take an Allen wrench and heat the end of it up, preferably with a propane torch. You need to get it really hot. Once you do, quickly hold it to the tip of the fiber (but do not touch the fiber). The fiber will mushroom out on the end. If you screw up the first time, no big deal. Just push the fiber out a little more and clip the mushroom off with a pair of nail clippers and try again.