Bergman Spanner Wrenches are made from the best Aluminum-Magnesium alloys. Ultimate strength is 38-44,000 psi. Properties are retained from minus 76 degrees F. to plus 225 degrees F. It will not become brittle with age and has the greatest stable shock resistance of any Aluminum alloy. The metal is spark resistant.

The ridges or "teeth" in both jaws will compress during use hardening the wear surface. This action will add years of unaffected service.

WARNING: While using all wrenches, it is important to follow basic safety precautions to avoid property damage, injury or death. Using any wrench as a hammer or sledging it is not a safe practice and any damage is not covered under warranty.