Intake/Exhaust Manifold Extended Spiked Stud Kit from Sickspeed.  This listing is for 10 studs, 10 washers, and 10 spikes. Stud length 50mm total length. Thread pitch is 8x1.25, made with hardened steel. Spiked screw on top of the stud, taking place of the nut. No more leaky headers, snapped studs, taping or drilling!  These are strong and durable with a clean finish. NOTE Washers are for intake side only !! Not intended for exhaust side. Don't forget to check out our other listings for parts and accessories to suit your ride. We are always expanding so keep an eye out for more supreme quality products from Sickspeed. Purchase includes a die-cut vinyl decal: Check out the manufacturer's website for more info and pics.