It is easy to damage the shallow torx head when removing the 3 bolts that hold a Direct Mount Ring to SRAM cranks. These bolts are direct replacements, or spares, for those 3 bolts. Many customers add them to the cart...just in case!
Any SRAM crankset that has a direct mount spider
This L-wrench makes installation of SRAM Direct Mount Chainrings a LOT easier