A Quality Knife,
This review is from: Rolson Tools 62845 Folding Lock-Back Utility Knife (DIY & Tools)
I have totally replaced a wide range of new and old utility knives, and other box-cutting tools around the house with this single folding utility knife.
It is extremely solid and well made, and of a good weight. The blades are easy to find in shops, very sharp, and easy to change whilst remaining firmly secured once fitted.
The locking mechanism is very sturdy, and I feel very safe using the knife, even for quite demanding tasks that require a fair bit of pressure to be put through the knife.
The only slight downside is that due to the toughness of the locking mechanism, and the general heaviness of the knife, opening it one-handed is a real challenge, despite there being a thumb notch for this purpose. I suppose with more use it might become easier to use, but nonetheless, this is well worth the money.