Don Dye pressed steel pulleys are designed to make a complete, economical, self contained unit for either flat or "V" side of belt. They are furnished with a single-row, radial-type, highest quality precision ground, pre-lubricated ball bearing (made of 52100 bearing steel) with contact-type seals to insure positive retention of lubricant and full protection against dirt, dust or foreign matter. These bearings contain a 60% fill of high temperature grease, no re-lubrication required.