Our standard 700 series, the heart of Boston Gear®'s speed reducer product line, has been serving industry reliably for over 40 years. Its proven modular design has set the industry standard for performance and is the most imitated product in today's worm gear speed reducer market. Its multi position mounting flexibility allows for installation in virtually any position, while internal baffles assure positive, leak free venting. Boston Gear® Right Angle Helical Worm Gear Drive, Single Reduction, Series: 700, 20:1 Gear Ratio, 0.27 HP Input/0.21 HP Output/0.25 HP Motor, No Flange Input, Solid Projecting Shaft Output, 0.3745 in Input, 1/2 in Output, 87.5 RPM Output Maximum Speed, 1750 RPM Input Maximum Speed, 149 in-lb, 1 in Centre Distance, 0.77 % Efficiency, Klubersynth UH1 6-460 Lubrication, No Base Mount, Cast Iron, Standard Gray Painted, 4.5 in L x 4.53 in W x 3.63 in H