These Redcat factory replacement differential spool ring gears are designed for the Ascent-18 Apex platform and feature a 20-tooth count. Sold as a set, the metal gears serve as direct drop-in replacements to restore drivetrain function after wear or damage. The spool design locks the axle for maximum traction, which is well suited to rock crawling use. Features: 20-tooth ring gear count Metal construction Spool differential design for locked axle output Direct factory replacement for Ascent-18 Apex 7/7/26 cs