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. Deluxe Flush Bolt 7 Inch Round End Regular price: $14.00 Sale price: $10.50 Flush Bolt 7-1/8 Inch Round End $9.99 Deluxe Residential Flush Bolt Regular price: $24.81 Sale price: $18.61 Von Morris Extension Flush Bolt Regular price: $31.46 Sale price: $23.59 Frank Allart Flush Bolts Micro 7/16" Wide Flush Bolt $2.68