Perhaps the simplest OWB belt attachment, the paddle. This allows the user to quickly put on and take off their holster. 
Our 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!