Perhaps the simplest OWB belt attachment, the holster paddle. This allows the user to quickly put on and take off their holster. 
Our holster paddle features two rows of wide slotted holes that allow your hole spacing to range from 0.5" to 1.5" on center.
The dual rows of slotted holes allow you a wide range of cant options too. Straight drop / zero cant. Plus or minus adjust ability clear out to 30 degrees!
This holster paddle would make a great addition to any OWB holster.