Keystone walls are not complete without caps.
They are available in four-inch high units with choices of face styles
and the option of tapered or flush sides.
Keystone’s patented Pinned System features
high-strength fiberglass pins that provide a shear connector, securely
holding geo-grid reinforcement and aligning units. Pins fit all size
units (except Country Manor which uses a shouldered pin). Two pins are
needed for each unit.