6698-050B QuickCable Black QuickCote Nut w/Bolt (50 PCS) - This 5/16"-18 X 1-1/4" black square head bolt and shoulder nut have both been treated with QuickCote™ to permanently identify the polarity (Negative) and for superior corrosion resistance. QuickCable offers a complete selection of standard and heavy duty battery related hardware that meets or exceeds OEM, SAE or Military specifications where relevant. Red and black fasteners are QuickCote™ treated for permanent polarity indication and superior corrosion resistance.