The Fenix ALG-03 V2.0 headlamp attachment is made from durable nylon and is specifically designed for attaching Fenix headlamps to outdoor or industrial work helmets. The ALG-03 V2 is compatible with the following Fenix headlamps: HL60R, HM61Rv2, HM65R, HM70R, HM71R, HM75R, HP30Rv2, and HP35R.