Osborne Brass Ventilator V-1 3/4" (144 pack) delivers one-piece solid brass construction with plain rims for reliable strength in plain rim ventilators. Sized at No. 3/4 with a 9/16-inch set hole diameter, these ventilators serve as breathers for mattresses, cushions, and plastic slipcovers, allowing air to circulate freely--an unexpected detail in elevating everyday outdoor seating comfort. Packed one gross at 16 oz per packet, they suit hands-on upgrades to patio cushions without complex tools.