4.000 Prefit - Hasting Original Ring Set - 5/64, 5/64, 3/16 Manufacturer: Hastings Mfg part #: 139 Hastings OE-quality piston rings are a perfect replacement for the stock or mild performance build up. Featuring Chrome ductile iron top rings, cast iron reverse taper second rings and Hastings famous Flex-vent oil control rings. Hastings ring sets feature standard ring end gaps for easy installation. Ring Specifications Bore Size Ring type Top Ring Second Ring Oil Ring Ring Tension 4.030 Pre fit 5/64 5/64 3/16 Std. Tension