This is a four pack of brushed aluminum caps that are 1/2" thick for the front and 1/4" thick for the back. The fronts are 1/2" thick have a 3/8" pocket in the backside for the dust cap clearance. The hole centers are 2" pattern, this will fit the Show Wheels Streeter. Free stainless steel bolts and a free hex key wrench Auction is for four center caps. If you have any questions please email or call 608-637-7167 at Dashman's Hot Rod & Speed Parts.