1、Choose high‑quality plastic and metal materials, and undergone precise processing to ensure durability. 2、High‑accuracy metal gear with hard anodized aluminum CNC middle shell, waterproof rubber sealing screw. 3、Fast heat dissipation, high torsion, good compatibility, and highly sensitive torsion compatibility. 4、270° 20kg high torsion waterproof digital servo for 1/10 1/8 rc cars, trucks, boats, airplanes, robots. 5、The kit contains 5 different steering gear arms to meet your different needs. Item Type: RC Servo Material: Plastic, Metal Model: DS3218MG Color: Black Torsion (5V): 19Kg/cm Torsion (6.8V): 21.5Kg/cm Speed: 0.16s / 60° (5V) / 0.14s / 60° (6.8V) Reduction Ratio: 310:1 Servo Blade Specifications: 25T/Ψ5.80 Gear Ratio: 275 Pulse Width Range: 500→2500 Μsec Working Frequency: 50-330Hz Neutral Position: 1500μs Controllable Angle: 180° Angle: 90° Dead Zone: 3μs Drive Mode: PWM Motor Type: DC Motor Gear Types: Copper and Aluminum Product Size: Approx. 40.5x40x20mm / 1.59x1.57x0.79in Fitment: Fit for 1/10 1/8 RC Car Truck Boat Plane Robot Wiring: Red - Positive Black & Brown - Negative Yellow & White - Signal Wire 1 x RC Servo 5 x Servo Arm 6 x Screw 4 x Sealing Ring 4 x Accessory