This Spectre breather uses stainless steel mesh as its filter mdeia, it features a triple chrome-plated steel top and base, and it comes factory pre-oiled and ready to use. Spectre Push-Breather fits 5/8 Tube, Triple chrome-plated 13.00 for both Find Spectre Performance 42859 Valve Cover Breather in Chino... 10 mm flange inside diameter By using the included adjustable worm gear clamp, this air filter will fit tubes with outside diameters from 3/8 inch to 1/2 inch (8-12mm). This Spectre breather filter, also known as a crankcase vent filter, has a flange with an inside diameter of 10mm. By using the included adjustable worm gear clamp, this air filter will fit tubes with outside diameters from 3/8 inch to 1/2 inch (8-12mm Includes a stainless steel adjustable clamp Stainless Steel Mesh Filter Spectre Performance 3995 Breather Filtered Stainless Steel Mesh 10mm Flange Breather With Clamp Fits 3/8 inch to 1/2 inch (8-12mm) tubes