V BLOCK DRILLING GUIDE IMPERIAL 3/64 TO #10. The portable V-Drill Guide ensures straight and accurate hand drilled holes on flat surfaces, corners and round parts! Heat treated for durability. 21 Drill Sizes: #10, 21, 25, 29, 30, 1/8, 33, 7/64, 36, 37, 38, 40, 3/32, 43, 45, 47, 5/64, 50, 1/16, 53, 3/64".