From The Anvil Sliding Window Stay Black

Sliding Window stay, Casement Stay,
Supplied with screws
2 Sizes Available

Part no: 83852
12 inch 304mm
Window Fixing Plate: 54mm x 16mm
Frame Fixing Plate: 59mm x 22mm

Part No: 83853
15 inch 381mm
Window Fixing Plate: 54mm x 16mm
Frame Fixing Plate: 59mm x 22mm
For casement type windows, holds window in place at a set opening by tightening the screw down adjustable turn/knob.

Comes complete with matching fixing screws.