1.Frame Thickness: 1.4mm; Frame: 90mm width2.Bottom sliding designs with ladder type to be more smooth drainage.3.This series could be made of three track with gauze (External)4.The sash connected by a tap to improve air-tightness and water-tightness and the bottom sashwith a leather strip5.Glass slot: 26.6mm, could install 5mm+12A+5mm tempered glass6.The series can be splicing window and bay window