ASMODAY …Cone Spike 28mm high Black- 1″ Bag of 20 08

They are easily applied with a screw and Phillips screwdriver. The screws are supplied with this item. Each spike has a tap on the bottom in which the screw is applied. 

Description and Specs:
height: approx. 1 inch, 28 mm
base diameter: 3/8 inch, 9.5 mm
material: nickel over zinc
finish: black nickel
color: black
screw type: inch 8-32, 1/4″ length thread
shape: round cone
Bag size: 20 spikes