Similar to Skunk2's industry - leading Pro - C and Pro - SII Coilovers, Pro - ST Coilovers feature threaded shock bodies, Pro - ST Coilovers offer height adjustments independent of spring preload, which help maintain adequate suspension travel on lowered vehicles for improved performance without sacrificing comfort. Quick and precise ride - height adjustments can be made for dialing in corner balancing as well as for improved handling, responsiveness, and overall balance.