... centralizers Material: Nylon Size: 3/4, 7/8 for 2-7/8 tubing Specifications1. sucker rod guide, sucker rod guides is also ... 2. Material: Nylon3. Size: 3/4, 7/8 for 2-7/8 tubing 1. sucker rod guide, sucker rod guides is also ... , 2-7⁄8, and 3-1⁄2 inch tubing.Rubber — a slotted, hammer-on, spring-backed guide; can be used on wells ...