Allstar 9/16 inch Box Wrench 3/16 inch and 7/32 inch Allen Wrench Valve Lash Wrench for Stud Girdles Assemblies features a valve lash wrench. It features a 9/16 inch box wrench and 3/16 inch and 7/32 inch allen wrenches. It is designed for use with stud girdle assemblies. The valve lash wrench saves precious time and eliminates fumbling with two separate wrenches. It is backed by a 90-day limited factory warranty and sold individually.