This TB Woods narrow V-belt sheave with a 3V belt section is made of cast iron and comes with one groove. It is a narrow V-belt sheave that fits narrow profile V-belts , allowing the use of smaller or fewer belts than classical V-belts to transmit an equivalent load, maximizing power transmission efficiency by reducing drive weight and size. This pulley is made of cast iron for resistance to wear, corrosion, and galling. It has a 3V cross section and one groove for use with single belts. V-belt pulleys (sheaves) are used in a wide range of mechanical and electronic drives, including HVAC units, farm machinery, food processing equipment, and home appliances, among others.V-belt pulleys (sheaves) are the component in a power transmission drive that transmits power to the belt. Typically made of cast iron, the pulleys and the V-belts that loop around them match in form – wide (classical) or narrow, single or multi-grooved. V-belt pulleys are found in drive designs in the agriculture, textile, printing, mining, and office equipment industries.TB Wood's manufactures sheaves, V-belts, couplings, bushings, and other power transmission products. Founded in 1857, it is based in Chambersburg, PA.