Review on 🔩 Innovative HSS6542 Steel Spiral Groove Stainless - Unmatched Quality and Durability! by Tim Beckett

Used today to pierce a 3/16 steel bumper (to mount hitch points). Using engine oil as a coolant and lower speed on a Dewalt brushless drill. I cut like butter. A hole was tested with the new 1/2 bit against the larger one in this set. The 1/2 bit took four times as long to go through the bumper and was less accurate than the stepped bit. Very impressed after about 6 exercises until I noticed dullness.