Hertel - 3/8-24 UNF, 3 Flute, 52° Helix, Bottoming Chamfer, Bright Finish, High Speed Steel Spiral Flute STI Tap - 07680820 - MSC Industrial Supply
Amazon.com: uxcell 3/8-24 UNF Tap and Die Set with 30mm Round Die Stock Handle Wrench, High Speed Steel Machine Thread Tap and Round Die Threading Tool : Industrial & Scientific