These are builder tabs for people on a budget. These are puzzled into our sheets when making other products- so we can offer them at a lower cost. All Economy Builder Tabs are laser numbered to avoid confusion. Sold Individually.
Features:

• 3 1/8 Inch Long Overall when setting flat. (79.38 mm)
• 2 3/4 Inch width Overall (69.85 mm)
• 5/8 Inch Hole (.635 Inch actual, 16.13 mm)
• 3/16 Inch Thick (.175 Inch, 4.45 mm)
• For 3 Inch Tube (76.2 mm)
• Measurement from center of hole to radius is 1.75 Inch (1 3/4 inches)(44.45 mm)