This is the 2-3/4 inch giant spike, our largest spike we have. Each spike comes with a screw for fastening. This spike is solid non-polished aluminum.(These items have a trace amount of zinc plating to help prep for other plating. These spikes can be plated but may not be anodized.)

Screwback Spike description:
height: 2 and 3/4 inches
base: 3/4 inch
color: silver nickle
base metal: aluminum
finish (plating): nickle
screw type: Size 1/4 inch - 20 NC Tap. 1/2 inch long.
shape: giant round tree-like spike
unit size: Bag of 100 spikes