Features: Made from HSS Steel. Ideal for cutting holes in a variety of materials including steel, brass, wood, plastic, etc. Titanium coated to reduce friction and heat. Heat treated and highly polished. Drills perfectly round holes in steel, brass, plastic, wood etc. 3-sided shank design to prevent slippage when chucked. Two flute design provides faster, smoother and cleaner cuts. Each step is clearly marked with the diameter depth. Specification: Surface Treatment: Titanium Plating. Colour: Gold. Drill Length: 4-12mm: Approx. 6.3cm / 2.48 inch; 4-20mm: Approx. 7.3cm / 2.87 inch; 4-32mm: Approx. 10cm / 3.94 inch Hole Sizes (in 2mm increments): ø 4 to 12 mm (5 steps): 4mm, 6mm, 8mm, 10mm, 12mm ø 4 to 20 mm (9 steps): 4mm, 6mm, 8mm, 10mm, 12mm, 14mm, 16mm, 18mm, 20mm ø 4 to 32 mm (15 steps): 4mm, 6mm, 8mm, 10mm, 12mm, 14mm, 16mm, 18mm, 20mm, 22mm, 24mm, 26mm, 28mm, 30mm, 32mm Package Includes: 1x 4-12mm HSS Drill Bit 1x 4-20mm HSS Drill Bit 1x 4-32mm HSS Drill Bit