From HB Racing:
This heavy duty center dogbone is thicker in diameter, which increases the strength and durability of the drivetrain. It’s standard equipment on the center/rear of the HB Racing D817T truggy and center/front of the E817T truggy. It can also be used as a heavy duty option part on the center/front of the E817 buggy.
Compatible with: D817T & E817T 1/8 truggies, E817 1/8 buggies.