This screw is the original 16mm length chosen by Elektra. If your grouphead bell is old and the female threads inside are not grabbing well, we suggest the 20mm length instead.
NOTE: We stock 2 different versions of the same screw; one is Phillips Head, the other is Flat Blade. If you prefer one over the other please specify which type you would like, in the comments box (final checkout page) or you may receive either one.
