A original RH7131 factory special deep 7″ long socket tool to remove the crankshaft pulley serrated nut. 3/4″ drive. For Bentley, all 1960’s, 1970’s,1980’s and 1990’s Bentley V8 engines and Rolls-Royce and Bentley V8 engines from late 1959 to 2008 with a few exceptions.