Servus® Studs Second Soles don’t slip on ice and slick, greasy surfaces. These Servus over soles are really second soles you add on in treacherous footing. Long lasting carbide studs bite into ice and frozen snow. This is traction you can’t get with regular outsoles. Extra strong stretch rubber to fit snugly over shoes and boots. Practical slip-resistant over soles store easily in a pocket or work belt until they are needed. Handy heel tap grips for easy on and off. Carbide studs are easily replaced with #SR201 kit. Replacement kit consists of extractor and inserter tool along with tough tungsten carbide studs. Made in the USA. Sold by the each.