6 Common Size - 3mm, 4mm, 5mm, 6mm, 6.5mm, 8mm, to satisfy all your needs. This drill bits set fits the majority of drill currently on the market. Premium Quality - Made of HSS Material with Titanium Coated, the drill bits edge sharp, faster with less effort. Provides 2X life over standard impact drill bits. Fully Ground Groove Design - Quickly decreases friction and heat for a faster and cooler drilling performance. 135° Split with straight prevents walking and makes drilling precise and faster. High Drilling Efficiency - The center of the product has sharp serrations, and with help, the drill can continue to drill horizontally after drilling.Long flutes for efficient chip evacuation. Wide Appilication - Suitable for thin board, wood, aluminum alloy, plastic, groove processing. Material: Metal colour: As shown Package Contents: 6 x drill bits Only the above package content, other products are not included. Note: Light reflection and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.