8MILELAKE Macpherson Strut Spring Compressor (Red) This item is designed to compress many MacPherson Strut Spring sizes The broad spring contact and built in detent pins help to lock the spring into place for safer This Tools Strut Spring Compressor quickly and safely compresses the spring for easy replacement of the strut cartridge or strut assembly repair. The hooks are forged and the center screw is hardened for long life.