This 633MCW high voltage coreless steel gear servo is perfect for scale crawlers, 1/8 1/10 monster truck, 1/8 1/10 2WD and 4WD buggies, as well as 1/8 scale buggies and trucks. In addition, this servo is great choice for boats and other applications which require high power, high voltage and waterproof. Waterproof IP67 level up to 1 meter which allow driving in the rain, puddles, snow and mud. Highly reliable and durable patent gear design. Full metal case for fast heat disipation. High precision digital control circuitry.Features: High performance standard digital servo Built-in magnetic sensor Waterproof IP67 High precision steel gear High efficiency coreless motor High strength dual ball bearings Specifications: Operating Voltage: 4.8-8.4 V Operating speed: 0.160sec/60 @ 6.0V, Operating speed: 0.1450sec/60 @ 7.4V, Operating speed: 0.135sec/60 @ 8.4V Stall Torque: 360 oz-in @ 6.0V, Stall Torque: 400 oz-in @ 7.4V, Stall Torque: 445 oz-in @ 8.4V Size: 40 * 20 * 37.5mm (1.57 x 0.78 x 1.46 in) Weight: 2.59 oz. Spline: 25T