I tried out some razor blades while insulating the outbuilding with rigid foam sheeting. Of the four brands I tried, OLFA was without a doubt the best! I've cut sheet metal up to 3" thick with no problem, the cuts were straight and precise for a tight fit between wall and ceiling studs. The OLFA is well made, well balanced and the blades are like surgical instruments. It beats and outlasts any Chinese junk 5 to 1. I bought another OLFA knife and spare blades for my car emergency kit. I give OLFA my unreserved recommendation!
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