Professional Thumbwheel Ratchet: Features a 160-position ratchet with a 2.25° swing arc, allowing for easy fastening in tight spaces. Professional 20-Piece Socket Set with Thumbwheel Ratchet. 20-Piece Socket Collection: Includes shallow and deep sockets ranging from 3/16″ to 9/16″, with visible size markings and color-coded rings for quick identification (Black for SAE).