Whitco Winder Lockable Chain - 5 Disc finish-Mahogany Pull handle set includes both

Pull handle set includes both internal and external handles

The A231 can be ordered with a lever or hexagonal handle

The LOCKTON 30mm Narrow Stile Mortice Lock Kit – Double Cylinder Function is a high-security solution designed for aluminum and narrow stile doors requiring key access from both sides

making it easier to install in tight or awkward frames

Brands such as Whitco

Whitco Winder Lockable Chain - 5 Disc finish-Mahogany Pull handle set includes bothThe Whitco 5 Disc Lockable Chain Winder is the go to solution for awning and casement windows the kind that crank open rather than slide. It replaces your existing winder while adding a proper key lock, giving you both smooth operation and genuine security in one unit. It's a particularly common upgrade in homes where the existing winders have aged, corroded or no longer lock properly. It also directly retrofits over older MK7 and MK8 Whitco chain