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5 Piece Double-End Boring Bar Set (3/8-1") ~ One end is 90° and one end is 45°. ~ Includes one each of BD-3, 4, 6, 7 & 9. ~ Double end. ~ Tool bits are not included but are sold separately. ~ The BD-3 bar is 3/8" in diameter and 6" overall. It takes a 3/16" square tool bit. ~ The BD-4 bar is 1/2" in diameter and 6" overall. It takes a 3/16" square tool bit. ~ The BD-6 bar is 5/8" in diameter and 10" overall. It takes a 1/4" square tool bit. ~ The BD-7 bar is 3/4" in diameter and 12" overall. It takes a 1/4" square tool bit. ~ The BD-9 bar is 1" in diameter and 12" overall. It takes a 5/16" square tool bit.