This Supermicro 4U Rail Kit (CSE-PT26L-B) has a 4U chassis handle and it is good for chassis with simple screw mounting. The rail kit is compatible with CSE-743 and CSE-745 and can extend up to 35.9" in length. This Supermicro rail kit has been fully tested and validated by Supermicro to ensure the best quality. *All the installation instruction could be found in the chassis or system manual. Manufacturer Supermicro Outer Rail Extendable Length 26" to 35.9" Rail Kit Type Rail Kits Designed For 4U-5U Compatible Chassis CSE-743, CSE-745 Mechanism Ball-Bearing Warranty 1 year warranty Product Environmental Compliance RoHS and REACH compliant, details available upon request