SET: 8 pc Stainless Steel Open End Wrench Inch Set: 1/4 x 5/16, 3/8 x 7/16, 1/2 x 9/16, 5/8 x 11/16, 3/4 x 13/16, 7/8 x 15/16, 1 x 1-1/16, and 1-1/8 x 1-1/4.
17-4PH Stainless Steel
Picture may not be of actual item. Picture is representative of the part family and its form/function.