Diamond Head Acrylic Upholstery Tack, 20mm Brilliant and clear faceted stone glowing with hints of rainbow prisms, illumination and sparkle 20mm stone encased in polished nickel. a bag of 10 diamond heads are great for you home arts and crafts projects. Affixded nail length is 1/2-inch made of solid steel Update your: dining room chairs, headboards, ottomans, sofas, all types of wood furniture, cornice boxes, walls, ceilings, picture frames, or where ever your imagination can take you Enhance your home furnishings and craft projects with sophisticated sparkle!