MillClaw is the proprietary design of The Holster Mill and is 3d printed with very high-quality material and is virtually unbreakable. The MillCaw not only usable on The Holster Mill products but will match up with any Holster that has Claw attachment outside of trigger gaurd with hole spacing of .75" center to center. If using the MillClaw with a different brand, be sure to get it with the hardware kit.