... energy-saving effect.2.Design unique, making easy. Outside frame part adopt tenoning embedded structure, conveniently delivered and carried for ... installing the outside frame component at building site after processing from the factory. Open casement part adopt 45°cutting ... aluminum;alloy2.temper:GR-63A01,L63-33,GR63A03,GR63A12,L63-32,M-180-69 etc.3.widely used in construction ,decration ...