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 a soft grip area, 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.