http://www.furniturerig.com/item/14512/sparco-automatic-utility-knife/ Sparco Products Knives & Blades SPR15850 Heavyduty utility knife stores up to four blades for automatic replacement. A new blade automatically snaps into place when old blade is removed. Features an ABS plastic handle with soft PVC antislip grip, durable metal chamber and auto safety lock. Comes with four snapoff blades that make it easy to maintain a sharp edge.Packaged Quantity 1 EachProduct Type Utility KnifeNumber of Blades 5 MetalCutting Style Straight Heavy DutyColor YellowBlackWeight (Approximate) 8 ozAdditional Information ABS plastic handle with soft PVC antislip grip Auto safety lock Recycled NoRecycled Content 0%Postconsumerwaste% 0%Assembly Required No