Cyclone HSS Premium Grade Annular Cutter, 5 8 in dia x 2 in Depth, 3 4 in Weldon Shank, Includes Pilot Pin no checkout stays adjusted for repetitive use Constructed stays adjusted for repetitive use Constructed of high grade heat treated alloy steel for maximum toughness and durability Produced from 8650 Chrome Nickel Alloy Steel Heat treated for superior strength Hex corners are sharp and clean Finished to resist rust Evolution standard geometry is sufficient for most drilling applications Manufactured specifically to maximize hole accuracy while minimizing cutter vibration and extending annular cutter life Using this standard geometry enhances accuracy and saves time This allows for a single ejection of slugs when drilling through stacked material