HIGH QUALITY SK5 HIGH CARBON STEEL: SK5 High carbon steel material is chosen to make blades utility knife blades refills high hardness and wear resistance. The excellent material makes utility blades for box cutter not easy to rust break and deform, have a longer service life, and are heavy-duty and practical utility knife blades. STANDARD BLADE REPLACEMENT: Standard size, suitable as a replacement blade for most folding knives, box cutters, and retractable knives, is a commonly used household tool. AND : The blades utility knife edges are precisely sanded, polished, , and , with good cutting performance. Use box cutter blades refills to cut quickly and the incision is smooth, great for cutting leather, rope, paper, carpet, rubber, cardboard, pipes, and more, and suitable for most DIY projects. PORTABLE PACKAGING: 100 pieces of box cutter blades refills are packed in 10 plastic storage boxes, 10 pieces in each box, convenient for daily use and carrying-enough quantity, perfect for sharing with family and friends to your handmade creations. WARM TIP: In , for the safety of your children, please put the knife blades where your children can' touch. Color:Silver Material:Metal Package Contents: 100 * Utility Knife Blade Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.