This is a 24mm diameter single use motor. It is ready to fly and doesn't need any motor hardware. You will still need a retaining system.
F44 White Lightning™ Economax (2-pack)
Motor F44 Manufacturer Aerotech Type Single Use (Economax) Flame White Lightning™ (W) Quantity per pack 2 motors Diameter (mm) 24.0 Length (cm) 7.0 Ejection Delay (s) 4 or 8 Average Thrust (N) 44.0 Maximum Thrust (N) 50.0 Burn Time (s) 1.0 Total Impulse (Ns) 41.5 Total Mass (g) 48 Propellant Mass (g) 20