Global Concave Shoes with threaded stud holes which have collars 

Polo Hinds 41/2 and 43/4 in 5/8x3/8 one stud hole in the outside heel

S
ports Horses fronts and hinds 43/4 to 53/4 - 3/4x3/8 (20x10) and 7/8x3/8 (22x10) two stud holes each shoe