Regular-thickness knives. There was a time when 1/4" was the minimum blade spine thickness for me. Then I figured out they don't cut things. Leastwise, not without a convex grind. Slipjoints: all modern, locking knives for this proud knuckle-dragger! Then I got tired of spending more money on knives, and decided to try some non-lockers at the low end. I learned what a lot of people already know: they do just fine.