Feature: Brand NewMade of good Aluminum with silicone insert.Reusable, no sealant required.Good sealing effect to prevent leakage.This is a non OEM product, accessory only!Specification: Material: Aluminum, SiliconeColor: Silver Tone, OrangeInner Diameter: 47mm / 1.85"Hole Diameter: 11mm / 0.43"Product Size: 104 x 71 x 4mm /4.09" x 2.80" x 0.16"(L*W*T)Fitment:for Chevy SBC BBC Engines Including 265 283 305 327 350 383 396 400 427 454 472 500Package included:1 x Thermostat Housing Gasket.