Reduced Head sizes in relation to Japanese Standard Institute fasteners. These may be a straight replacement for existing parts or your own replacement. REDUCED/ SMALL HEADS ARE NOT AS STRONG OR AND DO NOT SPREAD FIXING PRESSURE AS NORMAL HEADED BOLTS/ NUTS WOULD. WE WILL NOT ACCAEPT ANY LIABILITY FOR ANY LOSS OR DAMAGE CAUSED BY USING REDUCED/ SMALL HEADED BOLTS/ NUTS. PLEASE ENSURE USAGE WOULD NOT CAUSE ANY DAMAGE BEFORE FITTING