These sweet custom cross drilled thumb screws were produced domestically using low carbon steel material with plain finish.  Two different sizes were produced: M10-1.25 X 25MM and M10-1.25 X 30MM.  The head on both sizes measured 15MM in diameter and in height.  The cross drilled holes have a diameter of 6MM with a slight chamfer at each opening.  Typically a thumb screw like this would have knurling around the head but our customer decided to forgo that feature.