Mine are 1/2" caphead black bolts, no zinc.
my dampers were second hand with rose joints and were intended for the American market, and have a 12.7mm bore through the joint, hence the imperial fixings.
finding imperial bolts in a high grade was hard enough, zinc plated impossible. Once I've cut them down I'll take them to the platers with a lot of other little bits I need to get coated.
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