The Locinox 'Suby' is an in-frame drop bolt.  

FEATURES:

Height adjustability of the drop bolt 100 mm

• Throw 120 mm
• Internal dropbolt in aluminium
• Steel handle with black overmoulded POM 
• Internal push spring guarantees a perfect closure and prevents overpressure
• Designed for profiles up to 3 mm thick
• Fast & easy fixing: 2 screws
• User-friendly manipulation of the drop bolt at a convenient height
• For gate profiles: 40x40 mm, 50x50 mm, 60x60 mm and 60x40 mm
• 30mm gap required between post and gate