This Irwin ProTouch Retractable Blade Knife is ideal for general maintenance jobs. It has a lightweight, hard-wearing aluminium body which gives 6 times longer life. It also has thicker walls in areas of greatest wear, e.g., nose underside, and heel. The blades are virtually unbreakable, and have a quick blade change feature, spring-loaded push-button opener. It is designed to fit the hand, allowing maximum grip, and minimum wrist distortion. The blade slider is held permanently in place whilst a magnet holds the working blade in place. Spare blades are held securely so there is no edge damage, and no rattle, featuring a hinged opening mechanism. This knife has an optimised cutting angle to minimise fatigue and includes magnetic blade retention, and storage for up to 5 blades. Patented quick blade release for easy renewal of sharp blade edge.