Rezi Max Safety Knife Review

9 Nov 2025 · Rezi Max Safety Knife review: clever active-protection design with a big safety benefit, and the one flaw you need to understand. · Rezi · Rating: ★★★★★

Rezi Max safety knife
Titanium Safety Knife
Product Rezi Max Safety Knife
Best for Safer cutting tasks, opening boxes and reducing blade-related accidents
Good bits Clever safety mechanism, useful design and a strong active-protection idea
Annoyances There is one flaw that matters and needs to be understood before use
Worth it? Yes, if the safety mechanism suits your use case and you understand the limitation.

This is my Rezi Max Safety Knife review, looking at the active-protection design, the safety benefit and the one important flaw you need to understand.

Rezi Max Titanium Safety Knife

I love a knife. So this being about a knife should come as no surprise. This particular knife is a utility knife with a spring loaded retractor mechanism.

The mechanism holds the knife closed and to open it you push the slider. The default is closed and even when you open it the spring mechanism is pushing the blade back into the handle. As soon as you let go of the slider the blade retracts into the handle. If you want to lock it open you hold the body in your right hand and slide the slider with your left. When it gets to the end of the channel you tease the slider up and it locks the blade open.

Open Rezi Max
Open Rezi Max.
When it's locked open, it's on a hair trigger just waiting to snap back into the handle. The slightest downward pressure on the slide button and the blade snaps back.


The mechanism is interesting, it's a sliding tray that fits into the channels cut into the body of the knife. The retraction is powered by two springs, when they're relaxed the blade is in the body and 'safe' when they're under compression the blade is extended. The shaft on the bottom of the slider button stops it going past the end of the body when it's closed. I don't imagine it puts too much stress on the shaft when it snaps shut everything is made from titanium so there's not loads of mass smashing into the shaft when it retracts, maybe it's not going to last for ever but only time will tell.
Rezi mechanism
Rezi Mechanism.
Round the back of the body is a pocket clip, it's held on with two 1.5mm hex head bolts. The machining of the body, slide and button is good. They all have a stone washed finish and the button as well as it's two grooves has slight machining marks still visible under magnification, you can just about feel it if you run a fingernail along the beveled edge. I'm not moaning about this, it's interesting to see the machining marks. The body of the knife is 74 x 31 x 6mm at the thickest part between the pocket clip and button it's 14mm. It weighs 47gr with a stainless steel blade.
Pocket clip
Rezi Pocket Clip.
Rezi extended
Rezi Extended.
The body is a flat rounded lozenge shape with a bevel on both sides. It fits nicely in my hand and feels nice. It's machined from a single piece of material so feels solid. The tray slides smoothly within the body and doesn't wobble or bind. The channel the tray slides in reminds me of a squashed safety razor blade.
Rezi tray channel
Rezi Tray Channel.
The knife is a great performer and the theatre of it snapping shut adds to it! I've had it for a couple of months now and think overall the knife is great. To change the blade you lock the blade open and gently pull the blade, it slides right out. This ease of changing is also the knife's weak point.
Rezi blade change
Rezi Blade Change.
I've only found one thing I don't like about the knife and its this, when you have it locked open it's too easy for the blade to be snagged on whaterver you're cutting (think tape holding a box seam closed). When you slide the knife along the tape, I've had it a couple of times where the blade has become stuck to the tape, as you keep cutting the blade slides out of the body and stays stuck to the tape. This obviously renders the blade useless until you put it back in the body.

This is only a problem when you lock the blade open, when you have it on the slide it's locked in firm. Other than this the knife is perfect. I don't know how you fix this and keep it as easy to change blades.

Pros
Lightweight · Strong · Safe to use · Simple to change blades
Cons
Blade slips out easy when locked open · A bit pricey