The Shepherd Hardware 5/8-Inch plastic sockets are designed to accommodate bed glides and hold standard stem fastenings in tubular legs. Fix the white plastic sockets using a hammer, and these snugly fit furniture with a 5/8 inch diameter hole. Each plastic socket is compatible with 5/16 inch diameter and up to 1-1/2 inch long caster stems. One pack contains 4 plastic caster sockets.