Octura 0937 : 3 Blade for scale use. Reverse rotation Diameter: 1.48" (37mm) Total Pitch: .9x1.48=1.332"(33.30mm) Shaft Size: 1/8" (3.17mm) ATTENTION: Right-hand rotation. These spin clockwise when looking at them from the back of the boat. Used for twins or boats that require opposite rotation than normal.