Armeg Retractable Utility Knife Blade can be used to cut wires, plaster board and general materials. Quick-change system allows blades to be swiftly removed and replaced using the auto-reload mechanism, providing rapid and hassle free blade changes with no tools required. High-Carbon steel blade extends and retracts using an extremely smooth mechanism which also features 4 locking positions allowing different depths of cut for different applications. High-Carbon SK2 steel blades are heat-treated to provide the ideal combination of sharp edges and blade toughness for great performance and durability. Ergonomically designed finger groove provides additional comfort, controlled cutting and helps prevent finger slippage towards the blade. Ideal for trimming, splicing, general purpose cutting. Supplied with 5 blades.