Wide Range of Compatibility: Compress most sizes of MacPherson strut springs with the OEMTOOLS strut spring compressor; Quickly and safely compress the strut spring for easy replacement of the strut cartridge or strut assembly repair Locks Into Place: Safer spring compression with the broad spring contact and built-in detent pins; Strut compressor tools make changing front and rear struts safer and easier Long Lasting: Forged hooks and hardened center screw make these spring compressors the safest on the market Other Features Include: Heat-treated forcing screw and safety latches for locking hook to spring; These spring clamps are thoughtfully designed to be the only shocks and struts set you'll ever need Important Suspension Tool: MacPherson struts are the most important element of the suspension system in many modern vehicles, and should be replaced, on average, every 50,000 to 80,000 miles