Fence Claws by Cat’s Claw use a ¼” hex head, 2″ long self-starting screw to secure the claw to the post. There’s no hammering or pulling involved–You can use a power-drill to make the process so much easier! No more hitting your fingers in the cold, dropping and losing staples, supporting weak posts with your legs, or having to move wire to an undesirable position to accommodate post areas that can no longer support traditional wire staples!