The JP45 telescoping jack tray makes it possible to lift your vehicle off the runways of a four-post lift giving you instant access to perform wheel maintenance. With a 4,500 lbs. weight capacity per tray, its capable of safely and securely holding a vehicle with your choice of bottle jacks (not included). The sturdy, over-built design of the telescoping arms allows it to fit most four-post lifts out there on the market with an arm span of 35.75 to 44 in. The telescoping jack tray platform is ideal for use with one or two bottle jacks, which are not included with the kit. This gives you the flexibility of choosing which bottle jack is right for your application. If using only one jack, position it in the middle of the tray and do not exceed 3,500 lbs. If using two jacks, make sure they're spaced at least 12 in. apart from each other and not exceed 2,250 lbs. per jack (the maximum capacity of the JP45). With the bottle jacks in position, you're able to safely lift your vehicle from the runways giving you full access to your wheels, just like a four-post bridge jack. Material: Metal.