Quality washer for many applications, such as attatching accessories, chassis components, etc. They are not of the hardness requires for cylinder heads, mains and connecting rods. Available in black oxide and stainless steel. Washers have oversize I.D. to clear most under bolt head radii. Available for 1/4", 5/16", 3/8", 7/16", and 1/2" shank bolts and studs. Sold each.