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.
G74 White Lightning™ Economax (2-pack)
Motor G74 Manufacturer Aerotech Type Single Use (Economax) Flame White Lightning™ (W) Quantity per pack 2 motors Diameter (mm) 29.0 Length (cm) 9.3 Ejection Delay (s) 6 or 9 Average Thrust (N) 74.0 Maximum Thrust (N) 95.0 Burn Time (s) 1.1 Total Impulse (Ns) 82.8 Total Mass (g) 87 Propellant Mass (g) 39