BOOMSTART spring compressor: Is designed to compress almost all types of Macpherson style coil springs in the front and back. Mac Pherson 3 tension heads, universal suspension strut system, lowering chassis tensioner, car set for the springs found in most automotive applications. For springs that taper in one direction there is a spacer. So small and large adapters can be used together. All tools are packed in a molded storage compartment for easy transportation. Technical data: Clamping force: approx. 1000 kg. Maximum span 300 mm. Silver color clamping heads: 126mm-212mm Black color clamping heads: 88mm-160mm Golden color clamping heads: 65mm-125mm Tips: The spring compressor must never be used with a pneumatic screwdriver and impact wrench.