Available only in Quebec & Maritimes. The JBM Thrower Rack efficiently brings in your bales from the field. 72" side openings eliminate jams when starting to unload. Sizes: 8-1/2' x 20' or 8-1/2' x 24'. Available only in Quebec & Maritimes. The JBM Thrower Rack efficiently brings in your bales from the field. 72" side openings eliminate jams when starting to unload. Sizes: 8-1/2' x 20' or 8-1/2' x 24'. Available only in Quebec & Maritimes. The JBM Thrower Rack efficiently brings in your bales from the field. 72" side openings eliminate jams when starting to unload. Sizes: 8-1/2' x 20' or 8-1/2' x 24'.