uxcell Hex Screw Mounting Silver Tone Bike Chain Tensioner Adjuster 2 Pcs Product Name : Bike Chain Tensioner;Material : Metal Color : Silver Tone;Thread Dia : 5.5mm / 0.22" Overall Size(Each) : 4.8 x 2.5cm /1.89" x 0.98" (L*W) Weight : 22.8g Package Content : 2 x Bike Chain Tensioner