Coxreels SDH-100-1 Spring Rewind Static Discharge Hand Crank Cable Reel: 100' cable, stainless steel is part of our SDH Series COXREELS® selection. COXREELS® SDH Series “Static Discharge” cable reels are built heavy duty and designed for long lasting performance. They are specifically design to be used in combustible environments where the static buildup could ignite a spark and subsequent explosion. Static discharge or grounding reels are commonly paired with fuel hose reels .