Handrail Parts, Tee Pipe Size O.D. Fits over Pipe sizes 1.315 O.D. and 1.660 O.D. 1.315"OD - 1" Nominal ID - 33mm O.D. 1.660"OD - 1-1/4" Nominal ID, 42 MM O.D. Aluminum Alloy 535 Most corrosive resistant aluminum alloy available High strength as cast Bright attractive finish Conforms to ASTM B26 & B179 Featuring proprietary internal/external knurl cup point Tremendous resistance to loosening due to vibration Full contact of point greatly resists pull out and rotational slip