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Cree Led Diving Flashlight 860LM , 8 Degree Led Torch 860 Lumens SCUBA DIVING APPLICATION Check closely for cuts, scratches, or an otherwise damaged o-ring or mating lens surface as this can cause the light to flood under pressure. Remove any salt deposits, sand, dirt, or other foreign matter from the o-ring sealing surfaces. KEEP THE THREADS, O-RING GROOVE LUBRICATED WITH SILICONE GREASE. Advantage Features: Made of aircraft-grade aluminum with hard anodized finish/ black