4Pc Sickspeed Spiked Bolt For Engine Bay Dress Up Kit 10X1.25 P4 Black for Ford Mustang This is a set of 4 black&nbsp;Technidize&nbsp; finished spiked bolts Made from weapons grade billet aluminum. Ideal for most strut towers as a bolt replacement. Spikes weigh in at 20 grams a piece spikes have a total length of 40mm(1.57")