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: $13.10 Sale price: $11.99 Flush Bolt 7 Inch Round End Regular price: $14.00 Sale price: $10.50 Flush Bolt 7-1/8 Inch Round End $9.99 FB3 Flush Bolt Regular price: $30.60 Sale price: $24.48 Frank Allart Flush Bolts Micro 7/16" Wide Flush Bolt $2.68 Deluxe Residential Flush Bolt Regular price: $58.24 Sale price: $38.99 Extension Flush Bolt Regular price: $58.24 Sale price: $39.99