Standard Boring Bars Rigibore offers a range of standard, rotating tool, boring bars for rough boring, semi finish boring and finish boring operations. These standard boring tools can be used on HMC (Horizontal Machining Centers) and VMC Vertical Machining Centers. Rigibore standard boring tools range from cutting diameter 15.875mm to Ø450mm and a wide selection of them are held in stock in the USA, India and the UK. Available with shanks: BT MAS403 (⌀ 30, 40, 45, 50 mm) CAT (⌀ 30, 40, 45, 50 mm) ISO7388 (DIN 69871 A) (⌀ 40, 45, 50 mm) NMTB (⌀ 40, 50 mm) ANSI B5-50 (1985) (⌀ 50 mm) DIN 2080 (⌀ 40, 50 mm)