BUTTON HEAD BOLTS are an upgrade to standard socket head(allen) bolt. They feature a smooth, rounded finish. Styles: -A. Straight 3/8 (10mm) bolt-will fit 3/8 drop outs.
-B. Stepped 3/8 (10mm) to 14mm dropouts version (hub 10mm, frame 14mm)
not recommended for grinding! Use the hex ones! Sold individually
