The Gemfan WinDancer 3028 3 blade / tri-blade propeller is a highly efficient 3" prop with great maneuverability. It is compatible with both T type mounting and conventional 5mm mounts. - Gemfan WinDancer 3028 3 Blade Prop with 1.5mm T-Mount / M5 Shaft(Clear Blue) (2x CW, 2x CCW).