The EZ4 Guarded Self-Retracting Safety Knife features a spring-back blade that retracts after cuttings. The guards move in tandem with the blade while also covering the blade to protect the user and to help reduce damaged product. The blade can also be extended without the guard when needed. It also features a super easy blade change and can be purchased with UKH-324 or UKH-325 Holsters. Attach to CL-36 Coil Lanyard for better retention.