Universal knife with retractable blade. The Bosch Professional Universal Carpet Knife, with its robust aluminum housing, is durable enough for a variety of applications, from cutting carpets to slicing wires. The retractable blade can be extended to three different positions, and the ergonomic handle with soft grip surface, along with the extra-large thumb rest, allows for safe and effective one-handed operation, even while wearing gloves. The blade can be quickly and tool-free replaced, and three replacement blades are stored in the handle.