Cobalt 2-Flute Combined Tap and Drill, Size: 5/16-18 , Drill Size: .2660, Thread Length: 15/16", O.A.L.: 2-27/32". Designed to drill and tap thru holes in a single pass up to two times the tap diameter. Also can be used on multiple spindle heads with reversing mechanisms. Made in USA.
*Photos are for general reference of product. The photos are not specific to each size