Diamond Head Upholstery Tack Crystal Stone, Strike/Hammer Installation Tool The concave end of the hammer tool protects the threads of the screw while hammering in the nail Made of solid steel The strike/hammer tool is a one time purchase and can be used in multiple applications. Update your dining room chairs, headboards, ottomans, sofas, wood furniture, walls, ceilings, picture frames, let your imagination have fun Our trademark system allows you to change the decorative setting without replacing nails change your mind, change your tack, not your furniture