This Irwin Self Retracting Knife features a spring return shuttle ensuring the blade automatically retracts at the end of a cutting action. It is made of strong diecast aluminium with a 19° angled nose for more comfortable cutting, and to reduce strain. The knife's multi-functional design gives it two blade settings normal use and use as a box cutter. The blade holder is magnetic, preventing the blade from falling out, and has built in storage for up to three blades. Includes 1 x shatterproof bi-metal safety blade with 3 x longer life.