ACS Maindrive External Headset (Gold) (1") - 63827-5000
ACS Maindrive External Headset (Gold) (1") - 63827-5000, ACS MainDrive External Headset. Features: Forged steel cups Alloy tops, and a cap with sealed bearings Fits EC (traditional cup) applications Specifications: Size: 1" (25.4mm), 1-1/8" (28.6mm) Weight: 157 g