The process of retraction is smooth and the speed is even and stable.The spring included can be adjusted Safe and durable,specially handled with explosion-proof materials Grounding cable uses YZF type rubber and it has high resistance of high temperature,rust and oil Bonding cable(steel cable)is handled with specific process and has high resistance of break and high or low temperature A latching mechanism holds the cable at any desired length and a slight pull on the cable released the mechanism causing retraction. The stainless steel cable is 7 metres long,that's about 20'.The color of cover is optional,such as red,white and green,etc.