SODIAL(R) Racing Bicycle Part Silver Tone Metal 3-7 Speed Rear Derailleur Product Name : Bicycle Rear Derailleur;Fit for Hanger Bolt Diameter : 1cm/0.39" Overall Size : 13.8 x 10 x 5cm/5.4" x 4" x 2" (L*W*T) Material : Metal, Plastic; Main Color : Silver Tone, Red, Black