I needed the RIGHT drill bit so I could tap holes for some 5/16"-24 screws. I had the right tap but couldn't find the right drill locally. Shipping took a little over 2 days. but this it was No problem.The drill bit cuts perfectly through auto steel/damaged screw hole (7 holes total so I really can't measure durability.) Now I have a tap for future use RIGHT a drill when tapping/rethreading.