This is a 29mm diameter single use motor. It is ready to fly and doesn't need any motor hardware. You will still need a retaining system.
F42 Blue Thunder™ Econojet (2-pack)
Motor F42 Manufacturer Aerotech Type Single Use (Econojet) Flame Blue Thunder™ (T) Quantity per pack 2 motors Diameter (mm) 29.0 Length (cm) 8.3 Ejection Delay (s) 4 or 8 Average Thrust (N) 42.0 Maximum Thrust (N) 66.0 Burn Time (s) 1.3 Total Impulse (Ns) 52.9 Total Mass (g) 76 Propellant Mass (g) 27