The parts I ordered (MT1 to M12 mounting arbor for MM50/MM54 Micro chuck Ref : MM50MT1 and 3/4 inch to 16 tpi mounting bush for MM50/MM54 Micro chuck Ref : MM5034) were exactly as described and allowed me to fit my 3 and 4 jaw micro chucks from my Unimat, easily onto my ~30 inch wood lathe. Prices were unbelievably cheap (around £16 delived for the 2 parts) especially for something I couldn't find anywhere else. Delivery was also top-notch with e-mail updates and almost live tracking right to the door and the parts arrived really quickly. Top-notch all-round would recommend to anyone.