Never attempt to fasten into very hard or brittle materials such as cast iron,
tile, glass, or rock of any type. These materials can shatter, causing the fastener
and/or base material fragments to fly free and cause serious injury.
into soft base materials, such as drywall or lumber products can also
cause problems. These materials allow the fastener to travel completely through
and out the other side, endangering those in the path of the fastener.