Carbon-Ti X-Plug steerer expander is a practical and lightweight removable accessory which allows the locking of the headset cap adjusting bolt. The special design allows an extremely wide compatibility with most 1.1/8" carbon or aluminum alloy steerers on the market, they only should have inner diameter between 21.2 and 25.0 mm. It's 7075T6 Aluminum fully CNC made and with only 14 grams allows to save a lot of weight from stock headset expander systems. It's compatible with headset caps with M6 bolts and could be installed with an 8 mm hex wrench key. 100% Made in Italy.