Stainless Steel Harley Big Twin Breather Bolt Filter Kit CNC Machined from Solid 304 Stainless Steel - Made In the USA Hand polished to a mirror finish. Stainless steel snap rings and wire mesh. 3/8 X 3/4" Threads Fits 94 and up Harley Big Twins: Dynas, Softails, Touring and CVO. Will not fit EVO!