Check the listing for details. LOT OF electric linear actuator 12V 24v DC 2"- 4" stroke solar Robotics Rc Robot. Condition: Used. Listed at 45.00 USD. READ THE FULL AD BEFORE BUYING LOT OF 4 USED electric linear actuators various styles. May very from 3" to 5" stroke (4" is the most common) They work with12-24v DC Estimated at a few hundred pound lift capacity (200-500lbs) Built in limit switches at end of travel MOST are 3/8 mounting holes GREAT for robotics, moving holiday lawn decorations, and much more.. Reverse polarity(+/-) to change direction (extend/retract) THESE are USED and may have some cosmetic defects scuffs/scratches etc.. Since these are assorted actuators and a MULTIPLE QTY ad you will not receive the EXACT ones in the photos but similar items, if you don't understand this do not buy. Since these are assorted actuators and a MULTIPLE QTY ad you will not receive the EXACT ones in the photos but similar items, if you don't understand this do not buy. any measurements shown in the photos are only for reference only