... 1,window stays 2,materail: ss201,ss301,ss304 3,size: 12",14",16",18",20" 4,competitive good 4-bar heavy ... slider for strength, durabitity and smooth operation.• Be made of grade 304 stainless steel for maximum strength and longevity. High resistance ... Weight(kg)Opening Angle12”22.018.02.0/2.52530±2°14”22.018.02.0/2.53530±2°16”22.018 ... .02.0/2.5/3.04030±2°18”22 ...