The Trak-Star Twister Bit Annular Rail Drill Cutter is a high-quality drill bit designed specifically for rail drilling applications. With a size of 1-5/16" x 7/8", this black metal drill bit is suitable for use with a rail drill. Made in the United States by the trusted brand Trak-Star, this tool is ideal for professionals and DIY enthusiasts alike who need a reliable and durable solution for their drilling needs.