Espang for UPVC in Pollachi, Tamilnadu, India have a selection of Espang window locks are available. Initially, you want to know what kind of window lock you need. Espang locks are one-piece locks that fit inside the edge of the window and run along the full length. They usually have 2 or 3 'cams' which lock into receivers on the frame. Espang have different types of faceplates and these can also be of different widths.