Three antique roller / caster salvaged from an 1880's vintage Victorian pump organ. These were mounted one on the center back and one on each side of the front leg. These require about a 1-1/2" hole about 3/4" deep for mounting. Just as removed with original mounting screws. Iron wheel is about 1-1/4", top plate measures about 2-3/4" long by 1-3/4" wide - screw holes are 2" on center. Sorry for the shipping weight buy 3 castors weigh almost 1-1/4 pounds.