Hyde 42065 is a SwitchBlade metal utility knife with a 5/16"-7/16" exposure. Top-of-the-line die cast metal self-retracting utility knife with short and long exposure options. Safety knife blade automatically retracts when button is released. 1 heavy duty round-tip blade included. Round-tip blade exposure: 5/16" or 7/16"; standard blades: 3/8" or 1/2".