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PT-1800 ZS44/28.6 | ZS44/30 1-1/8" Internal Headsets Ø28.6 * 44 * 30 Height: 5.1+ 3.8= 8.9mm Weight: 96g Bearings: 5/32" * 22 ball retainer Material: steel Finish: EDBK PT-1800 Drawing download