The subject innovation relates to a stud (stud) that are installed on the snow tires, enlarged base (1) to sikimyeo prevent the withdrawal spread the impact applied from a road surface; upper pole (2) formed in between the enlarged base (1); and core pins 3 provided in the center of the column (2); according to that, the core pin (3) characterized in that the cross-section of the annular external pins 4 are installed around the stud pin on an ice road surface the well bakhige while the stud will be dropped to improve the handling performance, braking performance, traction performance by significantly increasing the area to be ground on an ice road surface. Furthermore, the core of the blank space between the pin and the outer pin there is an effect of scratching the road surface of the ice during the ice road surface and the ground has the effect of greatly improving the handling performance, braking performance, traction performance.