1 . threaded rod with broad spring contact and built-in detent pins to lock the coil spring in place for safer spring compression; Easy to UseThis 8MILELAKE strut spring compressor is designed to withstand extreme pressure in any environment, ideal for professional mechanic and automotive repair novice. compress the coil spring to replace the shock absorber unit or spring; For repairs on bent struts, strut tubes, and damaged pieces; Easy and superfast setup. Wide RangeUsing a 34or 19mm socket and ratchet turn the main shaft compressing the strut spring enough to safely remove the fastener nut holding the cartridge. Wide compatible with most small and mediumsized cars. Locked in PlaceCoil spring compressor tool threaded rod with broad spring contact and builtin detent pins to lock the coil spring in place for safer spring compression; it allows for durable and smooth compression of springs both on or off the vehicle with hand or power tools. DurabilityCoil spring compressor tool constructed with forged hooks and center screw hardened for maximum strength and longevity. Easy StorageA plastic carry case is included. Easy to organize and carry the tool.