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