Unifix Form B Washers BS 4320B Hv140 Bright Zinc Plated - M10 (10.5) (Box of 5000)Unifix Form B Washers BS 4320B HV140 Bright Zinc Plated are designed to provide a secure fit for M10 bolts. Made from high quality materials, these washers ensure durability and reliability in various applications. High Quality Bright Zinc Plated Finish for Corrosion Resistance Designed to Fit M10 Bolts with a 10. 5mm Diameter Complies with BS 4320B Standards for Quality Assurance Ideal for Use in Construction and Engineering Projects Easy to Install