0.770" x 0.625" Hub Adaptor lets you connect robotics parts with a
0.77" hub pattern to parts with a 0.625" hub pattern. The holes for the 0.77"
pattern are un-tapped whereas the holes for the 0.625" pattern are tapped. These
adaptors are ideal for mounting two different hub patterns: mating hubs to
gears, sprockets or wheels.