Small metal devices worn on the rider's boot to help enforce the leg aids. Come in a range of severety, from very mild blunt spurs to severe roweled models.
made up of heel band, shank, and rowel, the spur is a tool used to persuade but not injure, the horse.
(climbing irons) - A pair of metal shanks with a sharp point at the base, strapped onto the inside of the leg and under the foot, used for climbing wooden poles.