I bought a Blue Reef Scuba Titanium Folding Knife, I guess it was 2 or 3 years ago. I got a black-handled one, but the blade was the lighter gray color of the blue one in the first pic. It comes in bright yellow and a couple of other colors too.
This Blue Reef Folding Knife is made of titanium; no-rust, no-magnetism, and no-maintenance! The folded 4.5" (11.4cm) knife fits conveniently into your pocket and opens into a full length 8" (20.3cm) knife. The 3.5" (8.9cm) blade with its sharp drop point tip, partial serrated edge, and a line cutter for everyday use has a spring-loaded lock for safety. Knife comes equipped with a convenient slide locking lanyard for added-security to clip to your BCD or harness. But it wasn't very sharp, and the line cutter was so dull it wouldn't even cut a piece of dental floss. I feel sorry for a diver who gets caught up in lines or nets and needs to use one of these to cut themselves free. I found out there was another problem with it for everyday kinds of things I use a knife for. When I stabbed the knife into a plastic bottle it didn't want to come back out. It was caught like the barb on a fish hook, and I had to saw my way out. So I ground a large piece out of the blade and it looked about like the second pic that I just made up. I thought I took a picture of it before but don't know where it is if I did. It was a 3.5" long blade to start with, and since it was already so screwed up, I decided to make it 3" long or less. So today I cut 2 pieces off with my angle grinder, and ground it down on the bench grinder. I took one of the tool rests off so I could grind vertically on the back of the blade to get a curve in it. I put a sanding disk in the angle grinder and clamped it in the vise and used it as a stationary grinder to soften the edges on the back of the blade. Then I sanded it with a 1/4 sheet sander and by hand. Now it's 2.8" long and should pierce plastic bottles and such very easily, without getting stuck. It looks like pics 3, 4, and 5, which include the knife I keep on my desk all the time.
That's an Outdoor Edge 3.0" RazorEDC Lite. It comes in a few different colors, and they make several other knives with interchangeable blades of 2.2" - 5.0" long. Plus they have knives without interchangeable blades.
Tool‑free blade swaps – Just press the push‑button for quick and ultra‑safe blade changes
Ultra‑light & grippy – Weighs a mere 2.1 oz, with a Grivory® handle and rubberized TPR inserts for superior control.
Compact yet capable – 3.0" blade, 6.8" overall—perfect for EDC without the bulk.
Secure and reliable – Features a lock‑back design and a stainless steel blade holder for the strength of a fixed blade.
Comes ready – Includes four razor‑sharp Japanese 420J2 stainless steel blades and a clip for convenient carry.
Combines RazorSafe™ System performance with everyday convenience. The RazorEDC Lite replaceable blade knife features a durable, one piece Grivory® handle with rubberized TPR inserts, and replaceable pocket clip. Comes with four blades. Compatible with 300 and 301 replacement blades.
Also available in a 3.5" model. I have almost 4 dozen blades for it. The 4 that came with it and 42 more that I got on sale, cheap, from Devil Dog Concepts. One in awhile I'll use a butcher's steel to straighten out the edge of a blade, but if they're dull, or just covered with sticky gunk, I pull them toss them in a SHARPS container. You should always hang onto the tip of the blades when changing them, not like the guy in the video who doesn't follow their own instructions.
It sure is nice being able to cut up lots of cardboard without worrying about sharpening my knife! https://www.scuba.com/p-blrktfpk/blue-reef-scuba-titanium-folding-knife-pink#main-product-tabs https://www.outdooredge.com/products/3-razorlite-edc https://www.youtube.com/watch?v=jyo1QbxxFbc