The Performance Tool W84010 8pc Long Handle Serpentine Belt Tool is a versatile and convenient set for any mechanic or DIY enthusiast. With fittings compatible with various idler pulleys requiring 15mm, 16mm, 18mm hex or 3/8" or 1/2" square drive, this tool set can release tension on serpentine belts with spring loaded idler pulleys. The long handle design provides extra leverage for even the toughest belts, while the 13mm, 14mm, and 15mm crowfoot wrenches add even more versatility. Made from heavy-duty alloy steel, the W84010 is built to withstand heavy use and provide reliable performance for years to come.