Door Lock Indicator,Stainless Steel Privacy Bolt Door Lock Indicator with Vacant Engaged Indicating and Screws Fittings for Toilet Dressing Room Use - Amazon.com
Amazon.com: Indicator Bolt Toilet Door Lock, My 402 Bathroom Toilet WC Indicator Privacy Dead Bolt Door Lock Vacant Engaged with Bolt Through Fixing : Industrial & Scientific
Maxbolt, Load Indicating Fastener | Direct Tension Indicator