These #WORKPRO utility box cutter replacement blades are of excellent quality. I like how they're housed and I like how I get 100 replacement blades. They will fit all standard box cutters. It's perfect for not only opening boxes or cutting them down but I also use them on various arts and craft projects. To get 100 blades at under $10 is a great deal. With the price of these going up I'd recommend buying several at this price!