Schwaben spring compressor tools are built with ease of use and safety in mind.
Beefy clamping jaws are wide enough to grip spring coils securely. Spring-loaded locking pins in each clamping hook lock them against the coils so they cannot slip off or turn sideways.
The large compression screw with heavy duty thread and hex headed nut opens the clamping jaws to 300 mm (11.8 inches), and may be turned by hand or spun with an impact gun.
This is the perfect spring compressor for occasional use. If you work on coil springs regularly, you may want to consider the Schwaben Professional Coil Spring Compressor.
This tool should be used only by a trained individual, familiar with its use. Compressed coil springs store a large amount of energy; improper use of this tool can result in serious injury.