Machined in Whistler, Canada from 6061 grade aluminum.
"Boosts" the non-drive side of your 6 bolt 142mm rear hub, using an extended end cap and a 6mm rotor spacer (16mm rotor bolts included). You will also preferably need to dish your wheel by 3mm to the non-drive side, to centre your rim.
Please allow enough time for your Boost Adaptor to be made - usually within one week, depending on your requirements.