See KME&';s Website for more details https://www.kmesharp.com/broadhead-sharpener.html *Pictures for reference. Actual Broadhead Sharpener (BH-100) and Spacer Block (BH-SB) not included. KME Delta Jaws When KME first designed the Broadhead Sharpener, most broadheads were relatively large. Recently, several shorter, and more compact Delta style heads have become quite popular. With the original jaws, these smaller heads aren&';t centered in the clamp correctly, resulting in inconsistent sharpening. To resolve this issue, KME developed these accessory "Delta Jaws" which center short, compact heads like VPA, Iron Will, Tuffhead Evolution, Ozcut, and others. Single or Double Bevel. Q: "How do I know if I need the Delta Jaws for my broadheads?" A: "The vast majority of broadheads do not require the accessory Delta Jaws. However, if your broadheads are less than 2" in length (such as VPA 250gr heads and under), then you&';ll need the Delta Jaws. Broadheads that are more traditionally shaped and over 2" long sharpen fine with the original jaws, no need to purchase the Delta Jaws."