Woodruff Key Assortment System of Measurement Inch Material Steel Material Grade/Class Ungraded Finish Plain Thickness Tolerance +0.001/-0.000 in Number of Pieces 72 Number of Sizes 6 Manufacturer Location Made in USA Includes (10) #A (1/4x7/8 in) (12) #6 (5/32x5/8 in) (12) #9 (3/16x3/4 in) (12) #5 (1/8x5/8 in) (18) #3 (1/8x1/2 in) (8) #15 (1/4x1 in) Plastic Compartment Box with Lid Chart Product Type Woodruff Key Assortment Key Shape Woodruff Rockwell Hardness B90