iStar TC-RAIL-20 20-Inch Sliding Rail Kit for Most Rackmount Chassis Solid Ball Bearing Sliding Rails Three Stages Temporary Lockable Adjustable Length Load Rating Up to 85 lbs. Standard Drive Bays: None Solid Ball Bearing Sliding Rails. Item is 1.75 inches wide Three Stages Temporary Lockable Adjustable Length Load Rating Up to 85 lbs. Standard Drive Bays: None Material of Main Chassis: 1.2mm SECC Steel