Kich Marketing Pvt. Ltd. Offers Door knob with Indicator Bolt. Kich Marketing Pvt. Ltd. Is into production of architectural hardware products and it is an ISO 9001:2000 certified company. This Indicator Bolt IB106S gives indication of "Vacant" or "Engaged". This indicator bolt comes in two finishes - satin and gloss and it is placed on the outer side of the door.