Clutch Drum One Piece 78 mm ID with 12mm x 1.50 Female threads.
These will work with most of our Friction drive kits with the 12mm x 1.50 male drive roller.
20 mm or .79" Hub OD
.934" or 23.79 mm deep inside of drum.
Over height 1.31" or 33.28 mm
Wall 0.73" or 1.86 mm
Depth of threads .332" or 8.43 mm