Permagrip® Screw Spike
-U.S. Patents 6,808,120 & 6,471,140
-Easily driven into SQUARE HOLES where cut spikes have worked loose.
-DRAMATIC increase in holding power.
-UNIQUE tie-grabbing fins lock like claws to prevent "back out."
-IDEAL for the TOUGHEST ENVIRONMENTS such as curves, switches, turnouts or bridges.