The point is splitted. You go through a punched hole with the splitted part and spread the two parts from the back to fix the nail into the leather.
Be aware: A metal tread is slippery on very smooth surfaces like stone or tiles.
The nails extend the durability of leather soles as you walk on the nails instead of the leather.
Length total: app. 12mm
Length point: app. 10mm
Length head: app. 2mm
width head: app. 7mm
headform: trapezial pentagon
delivery content: 10 pcs hobnails