Hi - it's about 3 7/8" closed, and about 3/8" thick. The blade is a hair under 3" long, around 3/4" at it's widest point, and just under 1/8" thick. It has been carried & lightly used (office use) but does not show much wear. I actually do not recall the blade steel, pretty sure it's stainless, I would guess 154cm (I am not the original owner and bought it for its classy looks, but I find that a small one-hand-opening knife works better for me in the office)