These nuts and bolts are intended to mount our 3.5 inch aluminum squares. If you are making a homemade Zap Plate or Syncrometer one can mount the plates with these 3/4 inch bolts. The 3/4 inch length is also useful as bolt terminals on a homemade zapper. Bolts fit through a 1/8 inch hole. Pack has 2 bolts with 4 nuts.
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