This is a high quality Generic ( meaning non OEM/non Optivisor ) option for replacing your broken Donegan OptiVISOR® headband visor headset frame, this is the headset structure without a lens. This is NOT an optivisor brand product but is a non OEM cost effective high quality replacement option with some upgrades such as durable aluminum adjustment locking  knobs and works the exact  same way as the original, but designed to be even more durable and easy to use.  This is a perfect replacement Visor & headband headset and adjustable headband in case your optivisor has finally  broken or just simply worn out, this replacement is less then half the cost of an original Donegan which does not have these upgrades.  Easy to use, just transfer your lens plate from your broken frame to this replacement visor headband frame and your good to go.