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Video of how to remove the F function from a Marks lock. 

101 Stockade gate is used when you want to protect your entrance door and make it so it can mount inside the brick mold jamb and have the lock...

101 Stockade gate is used when you want to protect your entrance door and make it so it can mount inside the jamb and have the lock exposed. This...

103 Patio Gate is designed to economically protect your patio or double door with out glass. Provides good security for your home and family with a...

103 Sentry is available in any size in 10 stylish colors in any size in single, double, round, arch and cathedral top doors. Choose from 10...

108 Security Door-~~is available in any size in single, double, round, arch and cathedral top doors. Choose from 10 stylish colors with a standard...

115 Gibraltar Security Storm Doors are available in 10 stylish colors, any size in single, double, round, arch and cathedral top doors....

115 Gibraltar Double Security Doors . Shown with optional transom.

131 Villa Cathedral top steel security door is available in any size single, double door with all the lock options and 10 stylish colors. Custom made...

131 Villa- is available in any size in 10 stylish colors in any size in single, double, round, arch and cathedral top doors. Choose from 10 stylish...