Round wood sash pins with key.

Plated steel pins to lock window in closed or ventilating position.
Removal key is needed to unlock. 
Window pin lock is recommended for wood sash windows. 
Easy to install.

Material: Steel 
Rod Diameter: 5/16 inch
Rod Length: 2-1/2 inch 

Includes eight pins and four keys.

Sliding window lock with key is priced and sold each.