Rear sights that fit slides machined for the Novak LoMount style .500 x 65 degree cut.
Three heights available - .325" (HD-004), .350" (HD-004.5) & .375" (HD-005) to fit all applications!
The HD-004 (.325") is the height of the original Novak LoMount sight, used primarily on Government Models and Commanders.
The HD-005 (.375") is the height of the "Tall" Novak LoMount used on the shorter 1911s, like the Officers ACP, Defender, Ultra Carry, etc.
The HD-004.5" (.350") is the height of some new models like Springfield's EMP-4 and Elite Models. It's also a great problem solving tool for Gunsmiths working to get the perfect height sight set on a 1911 without having to go too short or too tall. My favorite for Commanders!