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Technically manufactured from Beryllium Copper, this is a smooth 3/16" diameter bore, threadless type that lock into a drive dog and held in place with a lock nut. SPECS: 40mm (1.57") x 1.4 = 2.198". ( requires hand finishing before use ) The Octura X440, 3 Blade Metal Prop is a high performance "lifting" type prop, fits any 3/16" (.187") output shaft. The 2 blade X440 is also a good alternate choice. NOTE: This prop may have the same overall pitch as your stock plastic prop but, a metal prop is much stiffer at high RPM and provides the boat more crisp & consistent operation. Additional props may be purchased individually in slightly different diameters or pitches to further fine tune your model boat.