CTA Tools 4030 Coil Spring Compressor - Internal is designed to remove, install and compress coil springs that can be reached through the center of the coil. It features an Acme threaded rod, as well as forged, heat-treated alloy hooks. The compressor comes in clamshell style packaging. Heavy-duty construction allows for strength and durability. Whether tuning up your ‘68 Corvette or changing the oil on a John Deere tractor, CTA can supply you with the tools needed to do the job. California Prop 65 - Warning, This product contains chemicals known to the State of California to cause cancer, birth defects or other reproductive harm.