Here's how to change the blade of a utility knife:
1. Turn the knife over. Use your thumb to press against the back cover, then twist it left and right several times until the cover comes off. Then move the slider and pull it back to remove both the slider and the blade.
2. The slider and blade are separate. Remove the old blade, thread the hole of the new blade through the dot on the slider, and press it in. The blade tip will slide up along with the slider from the back. Then, replace the small cover.
3. A utility knife is a knife used for art and handicrafts, mainly for cutting soft materials. It usually consists of a plastic handle and a blade, and has a pull-out design. Utility knives come in various sizes, from about 20 cm to about 10 cm.
4. When using a utility knife normally, usually only the tip is used. Cutting, carving, and marking are its main functions. However, the blade of this type of knife is very brittle, and the blade cannot be extended too far when used. In addition, the hardness and durability of the blade (these are two different concepts in utility knives) also vary depending on the material of the blade.
