17mm HEX BOLTS offer a 3/8 bolt with a 17mm socket and 8mm allen option. There are three Button Head bolt styles available: -D. Straight 3/8 (10mm) bolt-will fit 3/8 drop outs. -E. Stepped 3/8 (10mm) to 14mm dropouts version -F. The peg version. This bolt has a longer 14mm step section that’s long enough for both a 14mm peg as well as a 14mm
