Works Components ZS56-ZS56 Reach Adjust Headset Reach Adjust Headset : 6mm : ZS56/28.6 | ZS56/40 ZS External threadless Complete Black

Headset will allow you to alter your top-tube length by +/- 6mm. Upper cup insertion depth: 11.5mm Lower cup insertion depth: 11.5mm Upper cup Stack height: 3.5mm - Total upper stack height including bearing cover: 9.5mm Lower cup Stack height: 3.5mm Upper