Tapered reamers for proper fitting of ball joints to spindles, tie rod ends to spindles, etc. These have 1/2" shank. The 1-1/2" per foot reamer, also known as a 7° tapered reamer, works with Speedway ball joints 917-20031, 917-20032, and 910-34323.
Measures a little less than 1/2" at the small end and 1" at the big end.