Easy and practical drilling tools for the assembly of cabinet units without use of industrial machineries. The reduced weight and dimensions make the drilling jig suitable even for use on building site. The bushing drilling guides are conceived to guarantee straight and precise drillings. The bushing drilling guides have lateral holes to empty all wood shavings during the drilling operations. The lateral brackets help for a precise positioning of the drilling jig. The integrated locking knob allows strong locking which is necessary for fast and safe drilling operations. The information printed on the surface of the jig help to find the exact position of the holes.