It fits heads sized 9, 10, 11, 12, 13, 14, 15, 16, 17 and 19mm. Fit Head Size: 9mm / 0.35", 10mm / 0.39", 11mm / 0.43", 12mm / 0.47, 13mm / 0.51", 14mm / 0.55", 15mm / 0.59", 16mm / 0.63", 17mm / 0.67", 19mm / 0.74.
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