Stanley Class 99 Retractable Knife (2 Pack)

I've owned a few of this model knife over the years. I've used them for anything from opening boxes to cutting/scoring drywall to scoring/cutting lead to line medical x-ray rooms. I don't recall ever having a blade slip out unless I accidentally put pressure on the blade release while using it. Having spare blade storage and a quick blade release are great features when you're on the job. No need to stop and take out a screw to split it open to change blades. Blade swapping is fast and easy.

Bought over a year ago still works great. Glad to own it