CAST BRASS NEW OLD STOCK ACORN FINIAL WITH A 1/8-27 THREADED HOLE ( 3/8” DIAMETER) .THE FINIAL MEASURE APPROXIMATELY 1 1/4” TALL AND 7/8” INCHES WIDE . THE ITEM COMES WITH A 1/4-27 BRASS REDUCER FOR USE WITH A HARP.PLEASE CAREFULLY VIEW THE MANY PHOTOS AND ALWAYS BE FREE TO ASK QUESTIONS.