Check the listing for details. 2 sets 4" Stroke Silent mode Linear Actuator with Brackets DC12V 1500N 10mm/s. Condition: New, Made in China. Listed at 73.68 USD. DESCRIPTION --Silent mode linear actuator, noise level: 35~40 dB. --Made of high-quality aluminum alloy, sturdy and durable. --IP55-rated protection sealed against dust, water, and corrosion suitable for outdoor use. --Linear actuators are actuators that create motion in a straight line. Unlike a motor, which creates circular motion, a linear actuator can be used with any application that requires moving something in a straight line. --Our linear actuators are powerful and reliable linear actuators for small to medium loads. --Stroke length: 4" (100mm) --Retracted length: 8.13" (205mm) --Extended length: 12.13 (305mm) --Diameter of mounting hole: 0.236" (6mm) --Diameter of shaft: 0.79" (20mm) --Travel speed: 10 mm/s --Duty cycle: 20% --No-load current: 0.5A --Max load current: 2.5A --Maxim.