This is a spring washer size 2 (for general use) Titanium is lightweight, corrosion-resistant, chemical resistant, and heat resistant. See JIS B 1251 for standard. Use where lightweight, corrosion, chemical and heat resistance are required. Works with bolts and nuts. ■ Screws and nails in a small quantity pack in the specified package unit. Please check the quantity in total. ■ We accept estimations in large sizes