Flush bolts are usually used to anchor the inactive leaf of a set of french windows or doors. They are usually mortised into the edge of the door or window, making them concealed and providing extra security. 4 Inch Flush Bolt $12.99 Flush Bolt 6-3/4 Inch Round End Regular price: $15.28 Sale price: $13.75, 10/$122.20 Flush Bolt 7 Inch Round End Regular price: $28.00 Sale price: $21.00 Flush Bolt 7-1/8 Inch Round End $9.99 Frank Allart Flush Bolts Micro 7/16" Wide Flush Bolt $2.68 Deluxe Residential Flush Bolt Regular price: $79.03 Sale price: $47.99 Extension Flush Bolt Regular price: $79.03 Sale price: $47.99