Remove debris faster and discharge particles easily6Pcs Titanium Alloy Drill Bit Set, Steel Step Drill Bit, Tapered Multiple Holes 50 Size, Kit with BoxDrill bit color: goldenMaterial: high speed steel (4241) + titanium coatingAluminum housing: 15 x 12 x 4 cm / 5.91 x 4.72 x 1.57 inches (approximately)One-step taper drill titanium drill bit set:1/4'' to 1-3/8'' drill bit: 10 levels (1/4'', 3/8'', 1/2'', 5/8'', 3/4'', 7/ 8``, 1'', 1-1/8'', 1-1/4'', 1-3/8'')3/16'' to 7/8'' drill bits: 12 levels (3/16'', 1/4'', 5/16'', 3/8'', 7/16'', 1/2' ', 9/16'', 5/8'', 11/16'', 3/4'', 13/16'', 7/8'')1/4'' to 3/4'' drill bit: 9 levels (1/4'', 5/16'', 3/8'', 7/16'', 1/2'', 9/16' ', 5/8'', 11/16'', 3/4'')1/8'' to 1/2'' drill bit: 13 levels (1/8'', 5/32'', 3/16'', 7/32'', 1/4'', 9/32' ', 5/16'', 11/32'', 3/8'', 13/32'', 7/16'', 15/32'', 1/2'')3/16'' to 1/2'' drill bit: 6 levels (3/16'', 1/4'', 5/16'', 3/8'', 7/16'', 1/2' ')feature:-Automatically start, no need for pilot holes.-Includes aluminum case with protective pad.-Made of long-life high-speed steel and coated with titanium to reduce friction and lower operating temperature.-Suitable for cutting holes in various materials below 25 degrees, including steel, brass, wood, plastic, etc.Package Included:5 x drill bits1 x center punch1 x aluminum box(Excluding other equipment)