Spindle sleeves (converters) allows a 9/32" (7 mm) wide door spindle to fit snugly in a 5/16" (8 mm) wide hub. Enables a firm & smooth doorknob operation. Made of steel material, & is zinc plated; sold in pairs.,Hardwick & Sons is pleased to offer vintage-style hardware for the many people who desire to fashion their homes with charm, quality, & style. The traditional-style hardware that we showcase are true & faithful reproductions of classic hardware pieces found in the many homes from across America throughout the past century., WARNING: Cancer & Reproductive Harm - www.P65Warnings.ca.gov,WARNING: Drilling, sawing, sanding or machining wood products can expose you to wood dust, a substance known to the State of California to cause cancer. Avoid inhaling wood dust or use a dust mask or other safeguards for personal protection. For more information go to www.P65Warnings.ca.gov/wood Spindle Sleeve Converters - One Pair