Constructed with a rugged aluminum alloy shell and a full-metal handle, this heavy duty utility knife is engineered for frequent retractable utility knife use and has passed a 1.5-meter drop test. The ultra-sharp SK5 high-carbon steel blades feature a dual-hardness design with blackened treatment, making them 5 times more durable and 5 times sharper than standard blades, and anti-rust treatment ensures long-lasting edge retention even when cutting tough materials like cardboard, rope, plastic, vinyl, leather, foam boards, and more. The retractable blade mechanism includes a secure slide lock to prevent accidental slips or retraction, giving you full control over cutting depth for improved safety. When the blade becomes dull, the intuitive quick-release button allows you to replace it in seconds—no screwdriver or extra tools required. Weighing just 2.6 oz, its compact, lightweight design fits easily into pockets, drawers, or toolboxes, while the built-in lanyard hole provides convenient carrying for professionals on the go. This versatile utility knife effortlessly slices through thick cardboard boxes, packaging film, carpet, rope, PVC, and leather, making it ideal for home, office, warehouse, or workshop use. Perfect for DIY projects, crafts, and detailed cutting tasks. Available in a value-packed 12-piece set, these retractable box cutters come in four vibrant colors—red, yellow, blue, and black for easy identification, making them ideal for family members, warehouse teams, or workshop use. Each tool set includes 20 extra SK5 steel replacement blades, ensuring you’re always ready to work. This eco-friendly, all-metal utility knife set makes a practical and thoughtful gift for any handyman, DIY enthusiast, or professional. Children should never use this utility knife alone without adult supervision. This practical and versatile tool also makes a thoughtful gift for friends, family, or colleagues, helping to strengthen relationships while providing a useful and fun present.Your satisfaction is our top priority. If you run into any trouble with the knife, don't hesitate to contact us. We are available 24/7 to assist you.