the socket have two size of hole , one is a standard 1 ", another is match with the lug nut. 19#,21#,23#,25#,27$,29#,31#,32 the socket have two size of hole , one is a standard 1 "(24.5mm), another is match with the lug nut.socket size:19#21#23#25#27#29#31#32#33# and so on. lug wrench socket