Specification
4.3H,4.5H,5H,5.5H,6H,6.5H,7H,7.5H,8H,8.5H,9H,9.5H,10H,10.5H,11H,12H,13H,14H,15H,16H,17H,18H,19H,20H,21H,22H,23H,7.3 square head, black,7.3 square head yellow head with positioning column,7.3 square head yellow head without positioning column