1/8, 3/16, 1/4, 5/16, And 3/8-Inch Neiko 10047A Extra Long Drill, Inch Length. Neiko 10047A five-piece drilling set features extended body for deeper holes and a greater grip. It is constructed of high quality steel to endure heavy duty operation while drilling into hard material. The pointed tips are sharp and provides a great center to start off your jobs. It features five common sizes to get all types of work done. This is a great tool set for any home improvement, garage, industrial workshop, or just to have as an addition. [LONG REACH]: Extra-long drill bits give you 12 inches of added length to work with and provides more stability during quick operations. [DURABLE]: These drill bits are made from heat-treated M2 high speed steel for excellent hardness, wear resistance, and toughness. [SMOOTH DRILLING]: Combining high hardness and sharp pointed tips, these drill bits easily puncture tough materials for a smooth drilling finish. [VERSATILE]: Long drill bits can be used for drilling into metal, wood, plastic, PVC, and many other materials. [INCLUDES]: This extra-long drill bit set has (5) standard sizes of 12-inch drill bits that includes: 1/8-inch, 3/16-inch, 1/4-inch, 5/16-inch, and 3/8-inch.