GearWrench 77 Piece SAE/Metric Ractcheting Tap and Die Set - 3887. The item in this listing is a brand new sealed product in its original manufacture retail packaging. Gearwrench Die adapter works on round and hex shaped dies. Gearwrench Ratcheting T-handles wind dies with a 5° swing arc and have a reversing lever to eliminate hand-over-hand turning.Twist lock guide system reduces the "walk back" of the die guide and keeps the dies centered while cutting. Die adapters work with the 3/8inch Drive pass-thru ratchet and socket system as well as socket accessories. Auto-locking feature allow the tap adapters to be removed safely.