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 Inch Long Overall when setting flat. (76.2 mm)
• 1 7/8 Inch width Overall (47.63 mm)
• 1/2 Inch Hole (.510 Inch actual, 12.7 mm)
• 3/16 Inch Thick (.175 Inch, 4.45 mm)
• For 1.5 Inch Tube (38.1 mm)
• Measurement from center of hole to radius is 2 Inch (50.8 mm)