Brass plated steel tack ring with a high domed head can be used to trim the bridle harness on rocking horses. Many other upholstery and craft uses. Size 13/16"( just under 7/8") diameter. Overall length approximately 1-1/8". Nail extends 3/4" into surface. To install, simply hammer-tap in. Sold per single piece.Use the drop down menu box at "please choose" for volume pricing.