Boring tool kit for finishing with 2 micron adjusting accuracy within a diamerter range of 8 to 100 mm, consisting of a size 54 boring head with 6 / 8 / 10 / 12 / 16 and 34 mm boring bars and cartridge BS 2CT T03 to hold TC.. 06T1../TC.. 0902.. and TC.. 16T3 inserts, with tools for assembly