Chenbro 84H323610-034 27.5-inch Rails Set for RM41300-FS81 4U Accessories Chenbro 84H323610-034 27.5-inch Rails Set for RM41300-FS81 4U Pictures × Previous Next Advice Tech Specs Sorry, we have no advice for this part! Model: Chenbro 84H323610-034Compatible with the Chenbro RM41300-FS81 4U Post spacing: 22.1-inch to 35.8-inch