Ordered they keychain To complete the min purchase for the Oct promo code. Once I got it I figured this bottle opener could live in the bed of my truck. Enlarged the hole to 3/8 to accommodate the 5/16 bolt, then attached to the rail using a T-Slot nut. Once right, it takes some effort to rotate out of position. I’m sure Rago can design something with flanges to prevent rotating, hint hint.