This looks like a spool but doesn't have a hole through. It does have a metal threaded insert at each end so it could have been used as a stand-off or a strain depending on what was threaded into this piece. It measures 3 inches in diameter and is 2 1/2 inches tall. It has a pink porcelain like glaze over a white ceramic interior. The metal inserts have a 5/8 inch dia machine thread 7/8 inches deep. The piece is embossed on one end "H.K. PORTER COMPANY INC." in 3/16 inch high letters followed by "DELTA-STAR ELECTRIC DIV. PHILA. U.S.A. in 1/8 inch high letters.