Bedside phone holder metal springs, lazy phone holder spring clip and hardware spring factory in Dongguan Heights cheap now a lot of direct sales, users are welcome to visit or phone call to order. Time is money, pick up is earned! Large torsion: 2.5MM Material: carbon steel wire Surface treatment: heat and then nickel plated small torsion: 1.5MM Material: carbon steel wire Surface treatment: heat and then nickel plated small shaft, male and female screw Material: Iron Finish: Heat again Nickel-plated