ITEM NAME:20x M12x18mm+M10x17mm Dome Bolt Nut Head Protection Caps Cover Hexagon Screw Description: - Intended for Hexagon shaped Bolts & Nuts - Improving the Finished Appearance of your Product - Hexagonal Heavy Duty Nylon - Protect Against Weathering & Tampering - Enhance Finished to Nuts & Bolt Heads Specification: - M12 Bolt & Nut Caps / Covers: - Size: 18x23mm - Inner Diameter: 23mm - M10 Bolt & Nut Caps / Covers: - Size: 17x19.5mm - Inner Diameter: 19.5mm Package Included: 10 pieces M12 Bolt & Nut Caps / Covers 10 pieces M10 Bolt & Nut Caps / Covers.Intended for Hexagon shaped Bolts & Nuts. - Enhance Finished to Nuts & Bolt Heads. - Size: 18x23mm. - Hexagonal Heavy Duty Nylon.