6 Most 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 Spiral Groove Design - Quickly decreases friction and heat for a faster and cooler drilling performance. 135 Split Point with straight prevents walking and makes drilling precise and faster.High Drilling Efficiency - The center of the product has sharp serrations, and with its 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: Metalcolour: As shownPackage Contents:6 x drill bitsOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.