The answer is 37.5mm
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12.7 millimetres
One and one half inches = 38.1 millimeters... Direct Conversion Formula 1.5 in* 25.4 mm 1 in = 38.1 mm
25.4 millimeters in an inch ... 10 millimeters in one centimeter, 1000 mm (millimeters) in one meter
1 inch = 25.4 millimeters3.5 inches = (3.5 x 25.4) = 88.9 millimeters (rounded)
One-fifth of an inch = 5.08 millimeters