• Best For: Bench lapidary and trim saws running a 1/2-inch spindle, trimming small stone, glass and tile at 4-inch capacity.
• Highlight: At .020 inch this is the heavier of the two 4-inch MK-303 sections MK lists (.014 and .020), so it holds a straighter line through dense rough than the thinnest option.
• Expert Note: The 1/2-inch bore is what separates this from part 153689 - the identical 4-inch .020 MK-303 bored 5/8 inch. Order to the saw's spindle, not to the diameter.