Compatible with professional/industrial sewing machines. This is a screw-adjustable gathering foot. It initially has oil on it. Please wipe it lightly before use. Features: Adjust the gathering amount with the screw. Remove the screw to use as a regular presser foot. Notes: Cannot be used on thick or stiff fabrics. Cannot be used on home sewing machines or special sewing machines. Shipped with secure, anonymous delivery. Ships within 24 hours.