These NEW billet breathers and a stainless steel element with a billet 6061-T6 top and bottom plate and are now available in a Black finish.Precision machined from 6061-T6 Available in -6, -8, -10 or -12 sizesStainless Steel washable elementCan be securely fastened with a -16 size wrench Heavy-duty construction 37mm Long x 40mm wide (1-9/16" x 1-7/16")