... Length: +/-4.5mm Standard:Strictly follow the ASTM A 554 and others.Features:1) Material of stainless steel: grade: AISI ... 201, 304 4302) Applied field: construction upholstery, and industry instruments (fencing, railing, security doors / windows, gate fittings, ... ,30x30,36x36,38x38,40x40,48x48,50x50,60x60,70x70,80x80 3) Rectangular pipes - Outside dimensions(mm) : 20x10,23x11,24x12,25x13, ...