For medium duty hobby knives; has a 3/8" shank. Manufactured from the highest quality carbon steel. Use these blades for very precise cutting and trimming of cardstock, plastic, light- to medium-density woods, and other light- to medium-weight materials. Blades fit X-acto, Excel, Huron, and other leading medium duty hobby knives. Comparable to X-acto X219 X619; Excel 10019 20019 21019 22619.
They are incredibly thin and brittle. They broke with minimal pressure. I was hoping they would be comparable to the ones that came with the Extracto knife I bought (made by another company) which was very strong and didn't bend. However, it is the other way around.
Pros
Use these blades for very precise cutting and trimming of cardboard, plastic, light to medium weight wood and other light to medium weight materials