Irwin 10504236 ProTouch Retractable Blade Utility Knife Irwin ProTouch Retractable Blade Knife is ideal for general maintenance jobs. It has a lightweight, hard-wearing aluminium body which gives 6x longer life. It also has thicker walls in areas of greatest wear, e.g. nose underside and heel. Virtually unbreakable blades and quick blade change feature. Spring loaded push button opener. Designed to fit the hand, allowing maximum grip and minimum wrist distortion. FEATURES Blade slider held permanently in place whilst a magnet holds working blade in place Spare blades held securely so there is no edge damage and no rattle Features a hinged opening mechanism Patented quick blade release for easy renewal of sharp blade edge