Extension bar with built-in light used in conjuction with a portable driving tool

An extension bar for use with a portable driving tool having a coupling member, said extension bar comprising:

• an elongated body having an internal chamber, said body having a socket for accommodating and receiving said coupling member of said driving tool at one end and a coupling member at an opposite end, said socket being connected to said internal chamber, said coupling member having a through bore connected to said internal chamber;
• and
• a built-in light assembly disposed in said internal chamber, said assembly comprising a light bulb, a battery, a circuit connection means for establishing electrical connection between said battery and said light bulb and including a switch mechanism for automatically switching on said light bulb when said extension bar is attached to said driving tool and switching off said light bulb when said extension bar is detached from said driving tool, and a tubular casing for housing said light bulb, said battery, and said circuit connection means, said tubular casing being made of an electrical insulation material for preventing electrical leakage from said battery to said elongated body and having opposing ends provided with thickened rims for retaining said light bulb and said battery, said assembly being disposed in said internal chamber so that said light bulb is adjacent to said through bore, whereby when said extension bar is attached to said driving tool said extension bar serves not only as an extension of said driving tool but also as a flashlight to illuminate a working area.