Hex holes ranging from 4.0mm to 8.9mm (inscribed circle) in 0.1mm increments. Find the proper design fit for hex nuts, hex bolt heads or other hexagonal parts based on your printer's output of this thing. Thickness of this thing is 3mm. SolidWorks file included.Print it using your favorite printer settings. Use it to determine what size to use in your designs. Typically, the actual sizes of the holes when printed will differ from the designed size (the size in the .stl model). Find the size hole that fits your part and use the designed size of the hex hole in your new design. Holes are in 5 rows of 10 holes each and their designed sizes are as follows: Row 1: 4.0mm to 4.9mm in 0.1mm increments Row 2: 5.0mm to 5.9mm in 0.1mm increments Row 1: 6.0mm to 6.9mm in 0.1mm increments Row 1: 7.0mm to 7.9mm in 0.1mm increments Row 1: 8.0mm to 8.9mm in 0.1mm increments