Two-Flute & Split Point Design: Two-flute and split point design prevents slippage, clears chips quickly and burrs holes, with reduced pressure, faster and smoother drilling and cutting. 3 Pitch Sizes: Different sizes can meet different needs, design for precision drilling different sized holes from 4mm to 32mm in diameter, covering various pitch sizes helps drill or enlarge different holes in one bit, optimal speed and accuracy. Suitable: Widely applicable for cutting or enlarging holes in materials like thin steel, thin metals (thickness 5mm), wood, thin iron, plastic, aluminum, PVC, fiberglass and etc. 100% Satisfaction Guaranteed: We promise to answer all your questions and dissatisfaction instantly. At the same time, we will give you a better answer definitely Material: HSS Steel + Titanium Coated Type: Column Drill Quantity: 3PCS Color: Gold Use: Aplly in pistol drilling, bench drilling Size: 5-Jaw pitch: 4-12mm (4mm, 6mm, 8mm, 10mm, 12mm). 9-Jaw pitch: 4-20mm (4mm, 6mm, 8mm, 10mm, 12mm, 14mm, 16mm, 18mm, 20mm, 14mm, 16mm, 18mm, 20mm). 15 pitch bits: 4-32mm (4mm, 6mm, 8mm, 10mm, 12mm, 14mm, 16mm, 18mm, 20mm, 22mm, 24mm, 26mm, 28mm, 30mm, 2mm). Note: 1. Wear safety glasses before drilling. 2. Please cool with water when working because of the high temperature, to extend the life of the drill bit and prevent clogging. 3. The speed is suggested to be 250-400RPM/Min.