Net Spikes are available in two sizes: Small 3/16” diameter, Large 1/4" diameter. Net Spikes are permanent intermediate attachments used to secure perimeter cable for bird net installations. They are most commonly used to anchor into masonry, concrete, and stone surfaces. Net spikes require a pilot hole to be drilled prior to installation. Once the pilot hole has been drilled, Net Spikes are permanently hammered into place along the cable perimeter. 100 per pack. Small Net Spikes 3/16” diameter require a 5.0mm drill bit. Large Net Spikes 1/4” diameter require a 6.5mm drill bit. Key Features and Benefits Intermediate Attachment Anchors to Concrete, Masonry, or Stone Small Net Spikes require 5mm drill bit Large Net Spikes require 6.5mm drill bit Use with cable diameter of 1/16” or 3/32” 100 per pack