65mm is about 2.56 inches.
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A common item that measures 65mm is a standard CD or DVD. CDs and DVDs typically have a diameter of 120mm, so the measurement of 65mm could refer to the inner hole or the radius of the disc.
answer is 14.3 Kg.
Bricks come in many different sizes. One of the most common is 215mm x 65mm. Add space for mortar and each brick will take up an area of about 225 x 75 (about 9 inches by 3 inches). Therefore there will be 36 bricks in each row and 30 rows so the wall will need a little more than 1000 bricks.
(1.61 inches) + (1.65 inches) + (1.14 inches) = 4.4 inches
54.4 inches.