Interchangeable for the Pro (22 needles) and the King Size (46 needles) Includes 2 clamps Your defective clamp is recyclable Original Manufacturer Part These parts have metal hooks that grab ahold of 2 of your machine’s legs at the edge of a hard surface, and have a textured black piece below which can be tightened onto the bottom of your hard surface to secure your machine in place. Be sure to attach with a snug-fit, but be careful not to over tighten. How to Replace: This is an external component of the machine. It is used to clamp the legs onto a hard surface, such as a table.