This is the "Gunsmith" version of the HD-001. It has been removed from the manufacturing process before the sight notch was machined, to allow the Gunsmith the freedom to create any sight notch configuration or size that he or his customer desires. Comes with base and screws.
Fits 1911 pistols with BoMar style adjustable sight equipped models with "Pocket Cut" style sight cut such as Les Baer, SVI, Nighthawk, Ed Brown and pre-2014 production STI. See HD-006 & HD-007 for additional BoMar applications.