Abstract: The invention is a guide arm for the use of electric drill. It is very precise, easily operated and has much potential. Sheet no. 1 is a drawing of the invention. Sheet no. 2 is a drawing that represents the components disassembled. The invention is used for carpentry business (mobile furniture) to locate the position of the required holes. Sheet no. 9 illustrates the use of the arm in making a hole in a base or in a ceiling of a wardrobe. Sheet no. 10 illustrates its use in making a hole in a side which is to be placed on a base. Sheet no. 11 illustrates its use in placing wooden cylinders on the sides. Sheet no. 12 illustrates its use in placing a side on a base.