This is a 38mm diameter single use motor. It is ready to fly and doesn't need any motor hardware. You will still need a retaining system.
Because of the impulse class (H), to purchase this motor you must be Tripoli, AMRS or ARA level 1 certified (or attempting a level 1 certification).
H219 Blue Thunder™ DMS™
Motor H219 Manufacturer Aerotech Type Single Use (Disposable Motor System™) Flame Blue Thunder™ (T) Quantity per pack 1 motor Diameter (mm) 38.0 Length (cm) 15.5 Ejection Delay (s) 14 Average Thrust (N) 222.0 Maximum Thrust (N) 279.0 Burn Time (s) 1.1 Total Impulse (Ns) 233.0 Total Mass (g) 261 Propellant Mass (g) 144