High speed steel step drills allow for drilling multiple hole sizes with one bit.Specially designed to automatically debug holes as it drills.A balanced double flute design minimizes chattering.This tough tool is suitable for all standard industrial materials:nonferrous metal,special steel,thermoplastics and duroplastics.This durable and versatile tool will center,spotdrill,bore and debug - all in one smooth,high performance working cycle.Titanium coated step drills are designed to handle repetitive drilling in metal,wood,plastic and PVC.The titanium coating is engineered to last six times longer than standard high speed steel bits.