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• Anti-Rust Wear Protection :The drill bits are coated with titanium, which prevents rust and wear, ensuring a longer lifespan. • High Speed Steel :Made of high-speed steel, these drill bits are durable and can withstand high temperatures, making them ideal for metalworking. • Twist Drill Bit :The twist drill bit design allows for precise drilling, ensuring a clean and accurate hole. 1. Drilling can be started easily without pre-drilling. Drilling speed is fast and friction is extremely low. 2. It is widely applicable to all kinds of metals, plexiglass and hard plastics. 3. It is very suitable for home diy and general construction and engineering. 4. Use with needle vice or low-speed drill (not applicable to impact drill). 5. Application: High speed steel drill bit set for wood, plastic and aluminum. Ideal for diy, home and general building/engineering use. Specification: Finish Type:Gold Material:High Speed Steel Tool Flute Type:Spiral Product description Material: High Speed Steel Color: Gold Coatingl Uses: Drilling holes made of aluminum, iron and other materials. Size: 99PCS/BOX: 16*1.5mm Twist Drill Bit 16*2.0mm Twist Drill Bit 15*2.5mm Twist Drill Bit 10*3.0mm Twist Drill Bit 10*3.2mm Twist Drill Bit 8*3.5mm Twist Drill Bit 8*4.0mm Twist Drill Bit 3*4.5mm Twist Drill Bit 3*5.0mm Twist Drill Bit 2*5.5mm Twist Drill Bit 2*6.0mm Twist Drill Bit 2*6.5mm Twist Drill Bit 2*8.0mm Twist Drill Bit 2*10.0mm Twist Drill Bit