These are front sight blanks for S&W as well as other revolvers. If you are looking for a custom height you can take a blank and trace either type of design (pinned or spring loaded) on these blanks.  Then with some machining or filing you can then get a custom height.

These are shipped without the fiber installed but with both Red and Green Fiber rods included.  Roll pins are also included.

These blanks measure 0.733 tall and 0.120 wide.