Whitco Window Bolt - CYL4 Key 83/40 The video says it all

The video says it all

Brass indicator trim

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Whitco Window Bolt - CYL4 Key 83/40 The video says it allCYL4 One Key Security, can be matched to most door locks for one key convenience Features Silca LW4 keyway high security, robust construction, resists attack concealed fixing for security and style ergonomic knob design for ease of use contemporary & modern design key to lock, key to unlock twist and pull to remove bolt strong 9. 5mm steel bolt bolt engages without locking for safety allows window to be locked in closed or secure ventilation position