This Threaded Prop Adapter is the same one that is included with 2205, 2208, 2212 and 2215 series Scorpion Brushless motors. Machined from High-Quality Aluminum bar stock, it is designed to fit on a 3mm motor shaft, and has a 5mm threaded prop shaft. The Scorpion 3mm Threaded Prop Adapter weighs 5.1 grams, and can be used on any brushless motor with a 3mm shaft.