SQlab adapter sleeve for 31.8 mm handlebars in 35.0 mm stems.
Colour: black anodized.
Warning! The use of the SQlab handlebar shim alloy 31.8 mm to 35.0 mm reduces the ASTM release of all handlebars thatare used in combination with this sleeve. The combination of handlebar and handlebar sleeve has a release according to:Category 2 ASTM F2043 - 13/ DIN EN 17406
You can find detailed information here