2 post surface mounted lifts are the most popular type of surface mounted lift purchased today. These lifts are usually frame-engaging and have swing arms which travel up the two columns. 2 post lifts are synchronized mechanically, hydraulically or electronically. 2 post lifts make a clicking sound when lifting…it’s the load holding device. To provide support, always lower the lift onto the load-holding-devices. Some 2 post lifts are equipped with an overhead shut-off bar