It's my home made spring compressor. I went to my local hardware store and bought a 24" piece of 2" square tube, 2 pieces of 1" x 1/8" strap, and a small piece of 2" x 2" x 1/4" angle.
How it works is you secure the bottom of the shock into the lower bolt on the strap part, fit the top of the spring into a vee notch that has been cut into the angle, and lower the strap arm down and remove the spring keeper.
Total cost was about $ 15.00 and about 1 hour of time to construct. If you have a hammer, a vise, a drill, and hacksaw, you can make one yourself.
Tom