13pcs Extra Long Twist Drill Bits Straight Shank for Drilling Plastic Aluminum Wood

【MATERIAL】Made of high-speed steel for high hardness and durability, more abrasion resistant and than other metal materials. 【FEATURES】The extra long cutting edge allows you using these bits to drill deep holes,and the tips of drill is very shape,can make the drilling easier and more effortless. 【WIDE APPLICATION】The drill bits kit are great for most drilling jobs and materials such as aluminum, wood, plastics or your daily drill use. 【EASY TO DRILL】Sharp twisted drill bits will make the drilling easier and more effortless. The double flute chip removal design can speed up the process of drilling and chip removal. 【8 SIZES】4mm, 4.2mm, 4.5mm, 5mm, 5.2mm, 6mm, 8mm, 10mm, length 200mm, longer than the standard drill bit, you can freely choose the appropriate drill bit.