Roller chain wheels Sprockets: 3/4" Size 20th ID 48mm 8X4 Key 3/4" Size 22th ID 25mm 8X4 key 3/4" Size 20th ID Bearing Size 6205 3/4" Size 20th ID 40mm 8X4 Key 3/4" Size 10th ID 28mm 8X4 Key 3/4" Size 16th ID 48mm12X4 Key 1/2" Size 21th ID 25mm 8X4 Key 1/2"Size 14th ID 25mm 8X4 Key Roller Chain 3Meter Box: 08B -1 12B -1 16B -1 Plus Both Link, Lock, Show More