UltraLok Hand-Placed Interlocking Blocks provide for an easy, economical installation in areas prohibitive of heavy equipment due to site constraints and remote access. Both the 4.0” and 6.0” thick UltraLok blocks are shipped on pallets to facilitate movement as close to the actual installation as possible. Once the site is prepared, UltraLok units are manually installed directly on a filter fabric which allows for proper drainage. When back-filled with topsoil and seed, the end result is a synergy of hard armor protection with nature’s self-mitigating, “green” protection. Submar Synergy happens when our products compliment nature.