Tools | Smoothstart Pilot Drill Prevents Carbide Damage by Gradually Guiding Cutter to Material; Precision-Ground Carbide Teeth for Fast Cutting of Clean, Round Holes; Designed Specifically for Sheet Metal Cutting, Even Stainless-Steel; Over Drill Flange Built-in | Klein Tools' Interchangeable Multi-Bit Screwdrivers/nut Drivers Are Heavy-Duty Tools Designed for Professionals. They Are Made of the Highest-Quality Tempered Steel With a Torque-Proof Anchor in the Handle. Strong, Durable Tips Are Manufactured With Squar