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