18 mm is the diameter of the bolt. Length would be another measurement. In english, 1/4" (diameter)x 3/4" length . 18m is diameter. Length not given.https://www.google.com/url?sa=t&source=web&rct=j&ei=Q8mpVJ2fKJDugwTMk4CgDQ&url=http://us.mt.com/dam/mt_ext_files/Editorial/Generic/5/bolt_thread_types_dimensions_0x0002464400026aa20006025d_files/bolt.pdf&ved=0CDsQFjAK&usg=AFQjCNH7TXlNg3hayQJkyaQEjfWdjh3gcw&sig2=qloKAMByLOweer2iYgsG-g
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