Italian-threaded bottom bracket shells are typically found on Italian-brand road bikes. The shell measures 70mm wide and has a 35mm inner diameter.
This kit has all the pieces necessary to install 24mm diameter spindle cranks into an ITA shell. Those cranks come from Shimano, FSA, and others.
CeramicSpeed bearings pressed into threaded cups, then threaded into the frame. Super round, super smooth CeramicSpeed balls rotate in hardened-steel races.