Astro Pneumatic Ball Joint Separator Universal 78911 DescriptionThe Astro Pneumatic Ball Joint Separator Universal 78911 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 Astro Pneumatic Ball Joint Separator Universal 78911 has a 1-1/8” & 2-1/8” (30 & 56mm) maximum opening capacity.