TSS Espag Handle Cable Window Restrictors provide secure, controlled ventilation for windows fitted with Espag handles. Installation is straightforward—simply remove the existing handle, position the restrictor plate between the handle and frame, then reinstall. The locking mechanism requires a supplied key, minimising unauthorised opening whilst preserving full window functionality. Designed to minimise additional drilling, only the locking side requires fixings. Ideal for enhancing security and child safety across residential and commercial applications.