Stronglight JD A9 1" Headset.

Quality French made 1 inch threaded headset.

Specification:

• For 1" (25.4mm) fork steerers.
• Crown race: ø 26.4mm.
• Lock nut: ø 22.2mm.
• Frame cups: ø 30.2mm (+/- 0.05mm).
• Stack height: 38mm.
• Material: Alloy or Steel.
• Finish: Silver (alloy)
• Weight: 82g.