1: What are the components of this reciprocating mechanism? The reciprocating mechanism includes a geared motor, an adjustable speed power supply, and a reciprocating mechanism. The equipment is installed and shipped, and you can go back and in the 110V/220V household electricity to run. 2: Reciprocating mechanism stroke selection There are two types of reciprocating mechanism, the 1: Stroke of 30MM ~ 150MM (freely adjustable) 2: Stroke of 20MM~80MM (freely adjustable) If you need a stroke of 20MM~80MM you can contact to purchase. 3: The number of times of reciprocating expansion and contraction per minute The option marked in the option is the maximum speed of the motor with no load. For example: 24v240 rpm, which means: the fastest can be stretched 240 times per minute under this voltage. 12v45 rpm, which means: the fastest can be stretched 45 times per minute under this voltage. 4: How big is this push and pull?, Manufacturer: MJFVN