NORCO RL-20 Heavy Duty Slide Rail Type: Heavy Duty Slide Rail Specifications: Support 1U to 4U Norco rackmount cases. Ball bearing sliding rails. 22 inch (L) x 1.79 inch (H) x 0.5 inch (Thickness). With stop-latch, lock chassis in extended position for easy access. Tapped screw holes on outer member for secure and easy mounting. Load rating up to 145 Lbs; W/additional dia. 4.4mm x 45mm slotted mounting holes(2x). Standard screws #10-32 and Metric screws M4x6, M5x12 included, mountable to most chassis. Extendable to 32 depth.