TOOL-LESS INSTALLATION: Simplifies setup with thumb screws to lock shelf securely in place without tools COMPATIBLE WITH 4POST RACKS: Fits standard 19' racks from leading OEM brands with square holes HEAVY-DUTY SUPPORT: Holds up to 95 lbs, with a depth of 26.63' for mounting servers, PCs, and IT equipment ADJUSTABLE LOCKING MECHANISM: Thumb screws allow secure locking of the shelf, providing stability for heavy equipment VERSATILE MOUNTING DEPTH: Adjustable installation depth from 28.5' to 30' for flexibility in various rack setups