Thread pitch gauge [wc-pitch] Eliminate the confusion when trying to find the correct size bolt with our handy thread pitch gauge. It will reduce the confusion between 1.50mm and 1.25mm thread pitch, and easily assist you to select the correct length bolt. Do you have a buddy that doesn't know the difference between 1.25 6mm and 1.25 8mm, if so then get him one of these as a gift.