Navepoint Sliding Rack Vented Server Shelf 1U 19" 4 Post Rack Mount Adjustable 20" - 34" Dimensions: 2.25"H x 17.38"W x 19.81"D 77 pound weight capacity Slotted venting Lip Shelf Extension: 12.63" Made of high quality cold-rolled steel with a powder coating Shelf can support up to 77lbs Maximum mounting depth of 24.5&#034; and a minimum mounting depth of 19.75&#034; Shelf extends 12.63&#034; Compatible with any 19&#034; enclosure 1 4-Post Sliding Shelf M6 screws, cage nuts, and washers