Drill guide is sized for drill bit sizes: 1/8 to 3/8". 17drill sizes - 1/64" increments. 17 drill sizes include: 1/8, 9/64, 5/32, 11/64, 3/16, 13/64, 7/32, 15/64 1/4, 17/64, 9/32, 19/64, 5/16, 21/64, 11/32, 23/64, 3/8". DrillGuide® features a precision ground base to assure stability and accurate perpendicular alignment of drill bits on flat surfaces. Lifetime Warranty. 100% American made quality. 1 lbs (0.5Kg) shipping weight.