90 degree brass elbow, .040” wall thickness. I use these in player piano restoration to prevent kinking hose when rounding a turn or hard curve. For 1 1/2" hose. Other sizes available, check my eBay store. I've restored player pianos for 30+ years and am glad to answer questions before or after your purchase. I include my contact info in each shipment or you can reach me through eBay.