MARSHALLTOWN The Premier Line HT54 54-Inch Heavy Duty Drywall T-Square Silver anodized finish with black epoxy paint numerals for long wear and legibility Notched head, reverse rulings, and stud markings allow for quick, accurate cuts Aircraft-style rivets secure blades for long term accuracy Has one arm which measures 16" for use in finding studs Head is notched which enables cutting a 48" board in one pass while the board is standing on the floor