SODIAL(R) 2 Pcs Silver Tone Metal Diamond Back Burly Donut Chain Tensioner Product Name : Donuts Chain Tensioner;Material : Metal Each Size : 48 x 25 x 9mm/ 1.9" x 1" x 0.3"(L*W*H);Thread Dia. : 6mm/ 0.24" Hole Size : 19 x 10mm/ 0.8" x 0.4"(Outer Dia*Inner Dia);Color : Silver Tone Weight : 25g Package Content : 2 x Donuts Chain Tensioner