Phil Wood & Co used: Stainless Steel heat-treated "Classic" Spindle @ 110.5mm Offset, Campy/ISO square taper; Sealed Bearings, Shell silver aluminum. Includes original Phil Wood & Co Italian Mounting Rings set aluminum. Not for aluminum BB housing (see photo). Low mileage as not used since 1980s when replaced with "Pro" model, which I used and am still using on commuter bikes. Legendary BB manufactured in San Jose USA, durable, solid and not flexible, smooth and reliable.