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 1/4 Inch Long Overall (82.55 mm)
• 2 Inch Tall Overall (50.8 mm)
• 1/2 Inch Hole (.510 Inch actual, 12.95 mm)
• 3/16 Inch Thick (.175 Inch, 4.45 mm)
• Measurement from center of hole to flat is 1 1/4 Inch (31.75 mm)