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.
F27 Redline™ Econojet (2-pack)
Motor F27 Manufacturer Aerotech Type Single Use (Econojet) Flame Redline™ (R) Quantity per pack 2 motors Diameter (mm) 29.0 Length (cm) 8.3 Ejection Delay (s) 4 or 8 Average Thrust (N) 24.4 Maximum Thrust (N) 37.7 Burn Time (s) 2.0 Total Impulse (Ns) 49.6 Total Mass (g) 80 Propellant Mass (g) 28