1/8 inch Super-Thin: 70% slimmer than regular wrenches, thin open end wrenches reach fasteners in tight gaps. Flat wrenches fit well for thin nuts, narrow spaces, and hard-to-reach areas. 9-Piece SAE: 18 standard sizes, marked on both sides for maximum efficiency. 1/4", 9/32", 5/16", 3/8", 11/32", 13/32", 19/32", 5/8", 7/16", 1/2", 9/16", 11/16", 3/4", 13/16", 7/8", 15/16", 1", 1-1/16". Comes in a durable roll-up pouch for easy organization. Sturdy and Durable: Exceeds ANSI standard. Hardness up to HRC 50. Premium chrome vanadium steel, drop forged and heat treated for maximum strength. Fully chrome finished for lifetime durability. Wide Applications: Ultra slim wrench set is perfect for bicycle, motorcycle, car repair, table saw, household, maintenance, etc. After-Sales Service: For whatever reason, if you don't like this low profile wrench set, simply return and we will refund or replace.