The hook style recessed handle set includes a keyless exterior handle and it is non-manual, allowing it to be used on both left and right hand sliding patio doors. sliding door lock: size: lock length 7.8in / 198mm, hole distance: 6.6in / 168mm, with all necessary screws and fixings to fit. Function: sliding door and window handle lock, up and down slide switch. Scope of application: all kinds of sliding doors and windows. If you have any problem about our product you received, you can send emails to us at any time. We will reply you instantly and help you solve your problem.