General description Neilsen 8pc Timing Serpentine Belt Tension Setting Tool Pulley Kit is designed for efficiently releasing tension on serpentine belts. It features spring-loaded ball bearings that securely hold the sockets, making it suitable for most vehicles. Technical specifications Includes 1 Piece 3/8'' Drive Long Handle Wrench Includes 1 Piece 1/2'' Drive Short Bat Includes 3 Piece 3/8'' Drive Crowfoot Wrenches: 13mm, 14mm, 15mm Includes 3 Piece 3/8'' Drive Sockets: 15mm, 16mm, 18mm