Woodland Scenics H872 Hex Head Screws 1-72 1/2 (5)

What are Hob-Bits made out of and are they heat treated? The Hob-Bit products are made out of high quality brass and are not heat treated. What does Major Diameter and Minor Diamater apply to in your Hob-Bits chart? Major diameter is the measurement of the space from the outermost point of the thread on one side of the screw to the outermost point of the thread on the opposite side of the screw. Minor diameter is the measurement of the space between the innermost points of the threads.