Type 17 Gemini Cone Sq. Tip, 1.5 in D, 3 in Thick, 3/8 Arbor, 24 Grit Alum Oxide Designed for hard-to-reach areas inside castings, removing flaws and cracks or removing metal in corners Suitable for all steel, steel alloys and irons Useful in foundries, welding shops, fabrication facilities, steel mills