I've been looking everywhere the stock to make stainless steel mandrels in 5/64" size. I finally found some! This size is PERFECT. It's the happy medium we've all been wanting between the easily bent 1/16th size and the "too large to string on bead wire" 3/32nd size. These are made of 303L Stainless. We use 316L for the 1/6th size, but after testing the 303L, I believe that the 303L is perfectly fine for these slighly larger mandrels. I love them! I hope you do too.