Edit: My initial review gave this product 1 star because the color gets the hole sizes wrong. SAE drill bits marked with one size will not fit in a hole marked with the same size. Well, I measured the size of the shank, not the sharp end of the snaffle. Although the drills appear to be the same size throughout their length, some are slightly thicker along the shank. My updated rating gives the product only 4 stars because I felt 1 hole (5/32) was too small. I've tried 4 different 5/32 bits and none of the working ends of those bits will fit in this 5/32 hole.