78911 Astro Pneumatic Ball Joint Separator Universal DescriptionThe 78911 Astro Pneumatic Ball Joint Separator Universal is designed for separating the ball joint from the spindle support arm on domestic and import front wheel drive vehicles without damaging the ball joint, allowing it to be reused when assembled. Adjustable for different size ball joints. The 78911 Astro Pneumatic Ball Joint Separator Universal has a 1-1/8” & 2-1/8” (30 & 56mm) maximum opening capacity.