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.F E A T U R E S-Small Clamshell Vent - Covers holes up to 3/4 inchHose or wire up to 7/16 inch diameter. 1-1/2 inch L x 1-3/4 inch W x 7/16 inch H.