Roller chain wheels Sprockets: 3 4" Size 20th X4 Key 3 4" Size 22th X4 key 3 4" Size 20th g Size 6205 3 4" Size 20th X4 Key 3 4" Size 10th X4 Key 3 4" Size 16th X4 Key 1 2" Size 21th X4 Key 1 2"Size 14th X4 Key Roller Chain 3Meter Box: 08B -1 12B -1 16B -1 Plus Both Link, Lock,