This is a tap dice set that is commonly used in cars and motorcycles.
The dice are hexagonal types.
Easy to set on the handle and does not release torque when rotating.
[Size] UNF tap (fine): 1/4-28, 5/16-24, 3/8-24, 7/16-20, 1/2-20 UNC tap (coarse): 1/4-20, 5/16-18, 3/8-16, 7/16-14, 1/2-13 UNF die (fine Eyes: 1/4 -28, 5/16-24, 3/8-24, 7/16-20, 1/2-20 UNC Dice (Coarse): 1/4-20, 5/16-18, 3/8-16, 7/16-14, 1/2-13 NPT Pipe Taps: 1/8-27 NPT Dice: 1/8 -27 Tap Handle Dice Handle
[Material] Tungsten steel