One of the most popular helmet flashlight mount clamps, the Blackjack ACE Flashlight Holder is designed to fit round “Tactical” style lights. It's a fire helmet flashlight mount that also fits the Pelican M6, 2330, and 2300 series lights. This flashlight helmet mount also works great with the Surefire G2, G2D, G3D, G2L, G3L, 6P, 9P Fire and Rescue lights, as well as the Streamlight Poly-Tac series lights.

The inner diameter of the BlackJack Flashlight Holder ACE opening is 1 1/8".