SODIAL(R) Bike Bicycle Spare Parts Metal Chain Tensioner 5 Pcs Product Name : Bike Chain Tensioner;Material : Metal Color : Silver Tone;Thread Dia : 5.8mm/0.22" Overall Size(Each) : 4.7 x 2cm/1.85" x 0.78"(L*W) Weight : 59g Package Content : 5 x Bike Chain Tensioner