ACB38H6.3 Size：27.2x38x6.3 45°/45° Typical use 1" internal and integrated Headset. ACB38H6.5 Size ：27.15x38x6.5 36°/45° Typical use 1" internal and integrated Headset. ACB39H6.5 Size ：30.15x39x6.5 45°/45° Typical use 1-1/8" internal and integrated Headset.
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