... 2:1 bevel gear box speed ratio 1:1 or 2:1,transmission efficiency up to 95%.cast iron or aluminum gearbox are available. NOSEN 2:1 ... bevel gears,bearings,gearbox,input and output shaftsMaterials: 1.Spiral bevel gears: alloy steel,case hardened,be of ... gloss surfaces4.Input&Output shaft: S45C,heat treatedSpeed Ratio: 1:1,2:1. Special ratio,following clients' ordersTransmission Efficiency: 95%Gear Oil ...