The tool feels solid and well built. Compressed the factory springs on the Toyota Tundra, went down very well. Before use, I lengthened the threads of each tool to apply a little 3% high-pressure molybdenum grease and then, using a 19mm socket on the ratchet, compressed the springs, alternating 2-3 half turns on each compressor until the Spring was loose. enough to sit on a spacer. Then install the compressed spring onto the new shock absorber/strut.