Roller Chair, Material of Construction Cast Iron, 6 In Pipe Size, Max. Load 1,070, Max. Temp. 450 Deg F At Roller, Width 9 1/4 In, Standards and Approvals A-A-1192A (Type 44), WW-H-171E (Type 45), ANSI/MSS SP-69 and MSS SP-58 (Type 44)