Home Products Headsets P/No:LH-83BK: Standard Threadless Headset LH-83BK P/No:LH-83BK: Standard Threadless Headset Standard Threadless HeadsetsP/N: LH-83BKEC34/28.6 or EC34/30Alloy; Ball RetainersTop Nut: 1 1/8"Cup O.D.: 34Crown Cone: 30Stack Height: 29.8mm 1504287