Sylvania® Micanol Pin Tube Socket.EIA #312.Bottom Mount.Micanol Filled Body.NOS • New Old Stock.Fits in 3/4″ Hole Opening.Hole Centers: 1-1/8″.1/8″ mounting hole.Listing is for one (1) socket.21 sockets available.Flat rate of $3.95 shipping for any number of sockets.Shipped via USPS Ground Advantage® with Tracking. If you are unsatisfied with your purchase, please contact me. I pledge to resolve the issue.