These mesh vents are Ideal in vivarium building, they will give very good ventilation, whilst keeping the larger bugs in or out of the viv, to secure the vent in place,there is no glue required just pop it in the correct size hole and bend the tabs back to hold fast in place.
The Vent is approx 85mm dia and the cut out will be approx 76 mm (although I always advise to try on a scrap bit of wood first), the tabs are approx 20mm long so I would advise no more than 10mm thickness of wood or other material
1 X VENT SUPPLIED
85mm Dia approx
76mm Cut Out approx
Hole depth up to 10-12cm