Large Clam Shell Ventilator – Pair–These clamshell vents can be used to seal and splash-proof openings for wire, hose, etc. Also ideal for locker vents. Made from stamped stainless steel. Requires three #6 fasteners for installation. Skin packed.Large Clamshell Vent – Covers holes up to 1-1/4 inchHose or wire up to 9/16 inch diameter. 2-1/4 inch L x 2-3/16 inch W x 9/16 inch H.