GEARWRENCH has taken the ratcheting wrench design and applied it to the tap and die application with the GEARWRENCH 77 pc. Tap And Die Set. The Twist Lock guide system utilized by the tap and die set reduces the walk back of the die guide and keeps the dies centered while cutting. The die adapters in the tap and die set work with the 3/8 in. drive Pass-Thru ratchet and socket system. The blow mold carrying case with tilted tap holders securely stores and keeps the tape and die set organized.Limited Lifetime