Product Contents: Model TK143 Crank & G4 Model Set; Color: Black, Black; Shape: 5 holes (check the number of crank holes). Material: CNC Alloy 6061/T6 Aluminum Alloy, CNC Machined Finish. ● Choose from the size below 46T 48T 52T 53T 56T (T is the number of crank teeth. Count to see the number of teeth. Set Contents: 2 cranks, 1 chain guard, 1 chain ring cover, 2 special bolts, and mounting bolts are included, so you dont have to go to a new purchase. Quick and convenient installation.