This farm gate is designed to fit a 4' opening so it actually measures 3' 8".  This is so you have two inches to work with on each side.  

This farm gate is designed to fit a 6' opening so it actually measures 5' 8".  This is so you have two inches to work with on each side.  

This farm gate is designed to fit a 8' opening so it actually measures 7' 8".  This is so you have two inches to work with on each side.  

This farm gate is designed to fit a 10' opening so it actually measures 9' 8".  This is so you have two inches to work with on each side.