ERB Industries Omega II Secure-Fit Safety Helmet Suspension:Ratchet Style Their contact surfaces are ground

Their contact surfaces are ground parallel to the mirror surface to within 3 arcseconds

Operating costs are kept low with the included rechargeable battery pack and charger and a long

AP20 and all CS controller/tablets

Heavy duty metal clip on back

It can be mounted at the face and at the floor of the tunnel

ERB Industries Omega II Secure-Fit Safety Helmet Suspension:Ratchet Style Their contact surfaces are groundThe ERB Omega II Safety Helmet is built for reliable protection and all day comfort on the job. Molded from high density polyethylene, it offers superior impact resistance and supports optional chin strap use. Designed for flexibility, its certified even when the headband is worn in reverse. Choose between two suspension styles: Slide Lock (Standard): 6 point nylon with quick slide sizing (fits head sizes 6"8") Ratchet (Secure Fit): Easy turn knob