This tool is a must when servicing rebuildable ball joints from SPC. The 30mm spanner wrench has 5mm pins and is specifically designed for SPC's p/n 72610 Porsche arms and Builder Series of ball joints. The steel spanner features a 3/8" square drive to make removing the ball joint cap fast and easy. Use this tool in conjunction with a torque wrench to set ball joint preload and stud turning torque to where you want it or on any other project that needs this size spanner. California Residents WARNING