The Roto TSL Inline Espag 20mm features up to four pairs of dual reverse action locking points. When the handle is turned, the gearbox drives each pair of cams into double sided strikers from opposite directions. This ensures maximum burglary protection. In addition, the strikers are fixed to the profile with two screws which prevent the former from twisting, even in the event that a great force is applied. Suitable for aluminium, PVCu and timber profiles with a shallow euro groove.