... of air tightness, water tightness, wind resistance, thermal and sound insulation,etc., Different products are designed to satisfy ... : 6mm,9mm,12mm,16mm, etcOpening styleSliding, casement /swing, turn-tilt, tilt-sliding, single-hung, double-hung, etcSpecification(size, color,etc ... Available in any sizes as per your needs2. Simple and convenient operation, occupying small space, elegant in appearance3. ...