4 Rubber Vibration Isolator Mounts (3/4" Diameter x 5/8 Thick) 1/4-20 Female Threaded. These mounts measure 5/8" in thickness (rubber height) and 3/4" in diameter (rubber diameter) Threaded hole is 1/4-20 threads. Provides excellent noise and vibration reduction. Package Includes: 4 Rubber Vibration Isolator Mounts Can be used on/in: Water pumps ConstructionAutomobile Electronic components Medical equipmentHome applianceMechanical equipmentOffice facilitiesAviationAir compressorsDiesel enginesGasoline engines