I have two complete hardware sets for sale. One 3-Grain motor, and one 5-Grain motor. These casings are standard 0.058" wall tubing, 1.010" ID, and the bulkhead/nozzle liner steps have a diameter of 0.942". They are sized for 1.6" long grains. The 3G nozzle has a 0.187" throat. The 5G nozzle has a 0.265" throat. This gives a starting KN around 270 for both sizes. Both forward closures have a 10-24 tapped hole. I am including 6 orings with each set. These are for research use only! $45.00 for 3G set $50.00 for 5G set $90.00 for both This includes shipping to the continental US. PM with interest.