Amazon Basics Heavy Duty Retractable Auto-Load Ergonomic Utility Knife 3-Position Locking Blade with 4 Replaceable Blades in Designed Storage, Black/Silver

Honestly, this product amazed me. It's so sharp that it accidentally touched my toe, and I was bleeding like a fountain. I used it on cardboard, paper, tape, and even wood! It stripped the door wood!!I can't recommend this enough, sharp, compact and heavy.

Item is very heavy duty, can cut the cartoon with the knife

Best option! Great quality

very sturdy with strong handles and sharp blades.

good quality, but the lock to open the knife to access the replacement blades is in such position that you accidentally open the tool while working

It is great although a bit heavy.

Good quality. Serves its purpose.

nice

Ottimo rapporto qualità-prezzo. Taglierino robusto ed efficente.

Très bien

I have had -and lost- several knives of this sort over the years. All have been by the brand leader and, as a result, my expectations of them were high. However, they never quite lived up to expectationsas I found small but significant shortcomings in ease of use, convenience, and ease of changing blades.I had lost yet another and needing a replacement, I thought I'd give the Amazon Basics one a try, partly because ofthe price, good reviews, the description and apparent ease of use. The next day delivery provided by Amazon was another factor in its favour.It arrived yesterday and I soon got the immediate job I needed it for done and dusted.How I wish I'd bought one of these before. The first thing that was pleasing was the sensible packaging it came in - none of that stupid plastic bubble stuff that's impossible to get into without some cutting tool - stanley knife anyone????!!!!.Mercifully, mine arrived in a small but solid cardboard box. And yes, there were instructions although Amazon's site had video's and pdf versions of the instructions too. Actually the instructions are almost redundant. Once you have twigged to the purpose of the red plasic lock widget, how to remove it and and also put it back, the basic usage of the knife is pretty self evident.There are a couple of settings that allow the blade to be used with one of three possible blade extensions making it useful for different cutting jobs.Although there's no blade auto-change facility - given the price I wouldn't expect this - the folding design makes it very easy to change blades manually - the knife can hold three spare blades in the handle. The simplicity means there's less to go wrong too, always a virtue in my book.The knife seems well made and I like the design which is well thought out and provides a good balance between ease of use, convenience, and price without safety being sacrificed.Only real minus point is that plastic locking widget. It is perhaps too easy to lose and given the important role it plays in storing the knife safely, some way of making it an integral part of the knive seems desirable. Nevertheless, I'll stick with 5 stars as I can't award 4.5

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I have used a number of "Amazon Basics" products now and all have been exactly that - a good basic version of whatever they are for, and this utility knife fits that perfectly.It is solid and has a simple but effective mechanism using 'standard' blades, of which it comes with a bunch of spares stored conveniently and safely in the handle. Not sure "heavy duty" really applies, unless referring to the slide mechanism (which is a bit stiff - but likely will grow easier with use) although it is certainly strong enough for practical use and high enough build quality I expect it to last a long time.If you are after an inexpensive basic but good quality utility knife for general purpose use, then look no further.