This is not a T-15 bit. Maybe they tried to make it one. But that's not the case. To the little one. Rounded out the Torx 15 socket head screws on my LaRue mount. So I compared it to a caliper with several bits including 2 screwdrivers and Wiha bits (which I used to install it initially with no problems) and its diameter over the teeth is 0.005" smaller. So if you don't have SAE standard, Chinese "t-14 bolts". Should work great.
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