The 890 Casement Fastener is a traditional locking system for sash windows which comprises of a lever handle and a suited wedge fitting.
The handle is manufactured from zinc alloy, the lever is 100mm long and the base is 48mm long and 14mm wide. The wedge is also zinc alloy and is 50mm long and 20mm wide.
The hole centres are both approx 35mm. The handle and wedge are sold as a set, and the wedge is available in a flat or Ejma (bevelled) style.