Its 775/795 motor Grass Cutting Coupler with Blades Set. We generally use normal wood cutting blade in grass cutting but efficiency of that is too low. Here we invet a new coupler with HSS blades to cut grass very easily. Material Type is PLA with 100% infill. This Coupler is compatibe with D shaft 775 motor and thght fit. If you do't have a D shaft motor then you need to grind the shaft to make it D shape.
Its highly recommend to seal the motor shaft with coupler using feviquick or araldite gum.