Black Aluminum Valve Cover Washer Kit W/Bolts For Sr20/Sr20det Engines for Nissan Sentra This is a set of 15 washers/gaskets/bolts and paper washers. All bolts are stainless steel, so they will not rust. Hard annodized for a long lasting permanent finish Designed to work with the SR20 valve cover. 14 bolts are 25mm (1") and one is 40mm (1.5")