Mustad Endura Concave 3- 250 ct

Endura is a coating that provides up to 30% additional strength, so you are able use a slimmer nail where needed, and improves nail driving and reduces hoofwall damage. 

CONCAVE 

The name suggests the fit of the nail head when it is set into the shoe, flush with the ground surface. Having the extra length in the blade and reducing the outside angle of the head provides the perfect opportunity to maintain pitch and achieve the nail height you want.