Sets a new standard in strength and safety for strut spring compressors. New forged locking jaws includes larger pads and offset to clamp onto and compress springs even tighter than before. New extra thick 5/8” compression arms for superior strength, stability and safety. New locking trunions for optimal stability during spring compression. New lock rings to hold arms in position - standard. This eliminates arms from spreading or sliding when compressing offset or unique strut configurations. No tools needed to adjust. New spring capacity of 2-1/2” - 10” diameter, 1-1/4” - 24” vertical stroke. Extreme duty design to handle the heavier springs found on mid- and some full-size truck strut assemblies.