TAJIMA Utility Knife - 1 7-Point Rock Hard Snap Blade Box Cutter with Dial Lock & Rock Hard Blade - LC-650

Decently made. Comparable to Olfas knives. Locks securely, good grip. However, I found that when I need this size blade for cutting tougher material, its best to go to a standard utility knife with the trapezoidal blades (i.e. Stanley, Irwin, Milwaukee, etc), as those blades are stiffer, and one can even buy extra stiff trapezoidal blades if needed.

This is a one-of-a-kind tool as far as Im concerned. These knives are tough as nails and will do tasks that would destroy a standard utility knife. Ive never broken one I just seem to lose one now and then. A truly great product.

good tool for doing insulation

Good