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. 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 reques