1. Thank you for choosing our products Our new quick release rails are default designed for square hole racks but we have optional adapter for customers who use round hole rack and threaded hole rack For the threaded hole rack as long as the thread is M5 or larger our screws with washer can pass through the flange to mount this adapter on the rack to connect to our rail If customer s rack can install our chassis before basically this rail can also be mounted on their rack AURA YI N This adapter set is ready in our warehouse and for you to order anytime This adapter set will running change to put in accessory box of the upcoming chassis not in the current chassis yet imu Part Number MCP 2 90 00060 0N Part Revision Part Description Square hole to round hole rail adapter set Each set includes 2x bracket A 2x bracket B Screw bag is already in the chassis accessory box Remarks Bracket A will install on both front of left rail and rear of right rail Bracket B will install on both front of right rail and rear of left rail Images Documents For image click thumbnail below to view original size picture set a ea pees Rack Mounting Flange