4-point adjustable shelf can hold heavy and deep pieces of rack mount equipment. This can be used in place of expensive proprietary server rack rails. This 4-point adjustable shelf is capable of adjustable depth from 22 Inches to 40 Inches, making it ideal for any rack situation. 4-point adjustable shelf will expand to fit in almost any 19 Inches rack can hold 350 lbs evenly distributed. 4-point adjustable shelf is one of the most versatile and innovative products that we manufacture.