China low cost aluminum sliding/casement doors/windows with high quality on China WDMABrief specification: Certificate ISO9001 Opening style Sliding,casement, turn tilt,tilt sliding,single hung, double hung, fixed, etc Specification (size,color,etc) Different customers have different demands; special shaped windows can also be produced. You can send us your likeable window sample pictures. Frame materials thermal break, PVC, aluminum alloy Glass single double glass Regular glass, low E glass,Tempered glass, floated glass, reflective