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Knob - Round Shaft - 3.175 mm - Phenolic - Ribbed with Indicator Line - 20.2 mm. The PKA50B1/8 is a black Ribbed Knob with on-skirt indicator line. The PKA series 1-1437624-1 ribbed knob is made of phenolic with top spun aluminium inlay. 

Knob - Round Shaft - 3.175 mm - Phenolic - Ribbed with

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