The Mustad Plug 13 S is a heavy-duty, drive-in traction stud (often referred to as a "plug") designed for heavy commercial or draft horses. These flush-fitting studs provide immediate traction on slippery surfaces like ice, snow, and mud without the need for welding.

Product Specifications
Design: Features a conical, flush-fitting head that prevents snagging on terrain.
Dimensions: Typically features an 8mm diameter head (some variants listed as 5/16") with a 3/8" taper that fits securely into the shoe.
Material: Made with a tungsten carbide tip brazed into the body for superior durability and grip on hard surfaces like blacktop.
Installation: Quick and simple—just drill a 17/64" (6.8mm) hole in the horseshoe and drive the stud in using a soft-face hammer