I recently bought two folding box cutter knives. A SuperKnife SK Edge and a Lowe's Kobalt lock-back. Both were under $10. I was interested in comparing the unique mechanisms that each knife uses for holding the blade and for locking the blade open.
Here are some profile shots. The blue knife is the Kobalt, the black knife is the SuperKnife.
Blade side, open:
Lock side, open:
For locking the knives in the open position, you simply fold them open. The SuperKnife uses a liner lock, which contributes to is lighter weight and narrower profile. The Kobalt has a lock back which is the same as you would find on a common lock blade knife. This adds weight to the Kobalt as well as prevents if from being a one-hand open and close tool.
The following images show how to remove/replace blades on the Kobalt:
The following images show how to remove/replace blades on the SuperKnife:
The SuperKnife SK Edge comes with one SuperKnife blade installed. It should be noted that although the packaging states "holds standard & contractor grade utility blades", I only had some common Stanley blades to try and they didn't fit well at all. SuperKnife replacement blades are advertised as "twice as thick as a standard utility knife blades" and in fact they are. The SuperKnife blade was too thick to be used on the Kobalt knife. This problem I had with using standard utility blade replacements may be due to a defect in my SuperKnife. When testing the knife on a cardboard box using the SuperKnife pre-installed blade, it failed to hold the blade during normal use leading me to believe that's it's most likely a manufacturing defect. I have sent an email to the manufacturer asking to have mine sent in for repair/replacement. Only time will tell how that works out and I'll be sure to keep you posted.
Here's a picture of the SuperKnife failure:
As you can see with the Kobalt model, blade replacement is much more involved. The Kobalts blade holder is very similar to other generic folding box cutters that I have seen for sale. For me, it truley ads a lot of unwanted bulk to the knife. It works fine, but I much prefer the SuperKnife's blade holder.
In a nutshell, yes the Kobalt succeeded where the SuperKnife failed, but... Provided SuperKnife repares or replaces my defective unit, I rank SuperKnife the winner.
The SuperKnife is less bulky, has a thinner profile, weights less, can be one-hand open and closed and simply looks and carries better.
These are just my opinions and observations. If I can answer any questions you might have, I'd be happy to.
Thanks for looking,
EDIT (05/29/06) Unhappy with SuperKnife:
Gerber Knives received my faulty SuperKnife on Monday (05/22/06) and sent me a brand new on which arrived Saturday (05/27/06). I was impressed with how fast they reacted, however the new SuperKnife they sent me is in worse shape than the first one. I'm sending it back for yet another replacement.
At this time I rescind my SuperKnife reccomendation... Soon I will be receiving two other folding box cutters, The Camillus Camco Razor Blade Speed Assist and the Camillus Crossfire. Once those are in, I will be doing a review comparing all of my folding box cutter knives.