Neiko 00911A Tap and Die Set, Premium, SAE, Titanium Coated, 40-Piece CUT AND REPAIR SCREW THREADS: Tap and dies allow cutting and repair of external or internal threads by hand EASY-TO-START THREADING: Plug type, fluted coarse (UNC), and fine (UNF) tap and dies in SAE for easy-to-start hand threading applications HIGH STRENGTH ALLOY STEEL: GCr15 alloy steel construction provides superior blade hardness and thread cutting performance DURABLE AND ANTI-CORROSIVE: Titanium coating provides more rust resistance and durability than plain finished products HARD CASE INCLUDED: ABS hard case for organization, protection and safe storage