3/4" Dr. Impact Exension Item No. Size Pack KGS 773-708 3-1/2" 6 3.6 773-709 4' 6 3.6 773-710 6" 6 4.2 773-711 7" 6 4.8 773-712 8" 4 3.9 773-713 10" 3 3.7