That Allen is way too short for me. Everything I've experienced in 18mm is very tight. My Buick has 18mm in motor mount nuts, transmission mount nuts, ball joint nuts, tie rod end nuts, and lower control arm bolts. I'm actually in need of an extra long combination wrench. Even the long pattern is too short for ball joint nuts. I'm having to use all the strength I can possibly muster to get that castle nut lined up for the cotter pin. An extra long combination wrench would do wonders. I'm either going to get a Cornwell or a Snap-on.