Harder, Luckey & Hargrave Inc. manufacturers of the Tuf-Barrier™, the maintenance free alternative in sight and sound barriers. The Harder, Luckey & Hargrave Inc. Tuf-Barrier™ is the maintenance free choice in sight and sound barriers. Delivering an STC-32 rating - Bettered only by much costlier and cumbersome wall systems. Harder, Luckey & Hargrave Inc. takes great pride in its processing controls and the strength of its wall systems and stands behind its product line with A 20-year limited warranty on all its' manufactured PVC wall profiles.