usual Waterproof version
Sepcification:

Brand:Dsservo
Item: DS3218 20KG Large Torque Digital Servo
DS3218 PRO 20KG Large Torque and High Speed Servo
Operating Voltage: 4.8 ~ 6.8 DC Volts
Dead brand: 3mus
Weight: 60 g (2.12 oz)
Motor Type: DC Motor
Gear Type: Copper & Aluminum
Working frequence: 50-333Hz
Operating travel:180deg(PWM 500-2500mus)
OR 270deg(PWM 500-2500mus)
Size: 40 x 20 x 40.5 mm ( 1.58 x 0.79 x 1.60 in)
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Features:
– High performance digital standard servo
– High-precision metal gears with hard anodizing
– CNC aluminium middle Shell
– Dual ball bearings
Package Included:
1 x Digital Servo
1 x 25T Adjustable metal servo arm

The DS3218 is metal gear!

The DS3218 Pro is stainless sheel gear!

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