The 8 Piece Universal Quik-Lok Flat Boring is the unbroken compliment to any trade where wood boring is an workaday application. in the most vulgar sizes, and the addition of the Universal Quik-Lok All Hex Extension, makes this kit varied for any job no matter the trade. acceptable : 6 '' Universal Quik-Lok All Hex Extension ; 6 '' Flat Boring Bits : 3/8 '', 1/2 '', 5/8 '', 3/4 '', 7/8 '', 1 '', 1-1/8 '' and Case.