20 Pcs Black Bicycle Bike Chain Master Connecting Link 0.5" Pitch Product Name : Chain Master Link Link Quantity : 20 Pcs;Pitch : 12.7mm/ 0.5" Roller Diameter : 8.5mm/ 0.334";Width Bewteen Inner Plate : 6.3mm/ 0.248" Plate Thickness : 1mm/ 0.039";Total Size : 21 x 9 x 11mm/ 0.83" x 0.35" x 0.43" (L*W*T) Material : Metal