The mini box letter opener with a keychain is very convenient for school and office. And You could put it on the key ring to carry out easily. This can be used for cutting envelopes, food bags, plastic bags, and various packing bags. Mini razor knives with a thumb-slide blade, spring-loaded to auto retract for safety. The auto-retractable blade is safely hidden when not in use (Must hold rubberized slider button while cutting). Add your company name or logo on the letterbox opener keychain for more brand exposure.