The Swanson BBL480 48-Inch Aluminum Box Beam Level is Swanson"s flagship "built-like-a-tank" monster! A super-heavy-duty aluminum frame houses industrial-strength acrylic block vials and is finished with Super Shock end caps made from a proprietary polymer/rubber blend. The deep V-groove channels of the Swanson BBL480 allow the user to work with both round stock and squared corners. Superior-precision, multi-ring vials indicate drainage pitch for plumbers and landscapers and are accurate to .00050-inch. Features: * Super Shock end caps for superior shock absorption * Precision milled edges for increased accuracy * Heavy duty acrylic block vials accurate to .0005 in. * Multi-ring vials indicate 2 degree and 4 degree grade for drainage * Cushion-grip hand holes * Deep accurized V-groove for round and square stock What"s In The Box: * Swanson BBL480 48-Inch Aluminum Box Beam Level