A bag of 20 of the 5/8 inch thin-tree spikes. It is about 5/8 inch in height and thin. Each spikes comes with a screw for attachment.

Screwback Spike description
height: 5/8 inch (15 mm)
base: 5/16 inch (8 mm)
color: silver
base: steel
screw type: metric 4/.7, 1/4" length
shape: round thin tree-like spike