Built from aircraft grade 6061 aluminum, and only 1.8ozSuperior under brim patented design securely holds the light on the helmet where you put it, where you need it. Fits nearly all firefighting helmets, both traditional and modern styles. The Blackjack helmet torch holder accommodates 4-AA size lights from Pelican, Streamlight, and UKE 4AA. The Blackjack will also accommodate the new generation of 123 size lithium powered lights from Surefire, and Pelican.