KKmoon 7pcs/set 300mm Extra Long Brad Point High-carbon Steel Wood Drill Bit Set Three Point Woodworking Drill Brad point starts bit drilling on center. Extra long(12" long) straight brad point. High-carbon steel, high quality with good durability. High hardness and sharp, perfect for drilling the extra thick wood. It includes 7 sizes in one drill bit set(4mm, 5mm, 6mm, 7mm, 8mm, 10mm, 12mm), which meet your different needs perfectly.