Tapered reamers for proper fitting of ball joints to spindles, tie rod ends to spindles, etc. These have 1/2" shank. The 2" per foot reamer, also known as a 10° tapered reamer, works with Speedway ball joints 917-20036, 917-20038, 917-20038-1, and 917-20039.
Measures a little more than 1/2" at the small end and 1" at the big end.