CeramicSpeed OSPW System, Compatible with Shimano 9100/8000, Standard - Black Other An 8mm hex head has

An 8mm hex head has a 4mm insert to fit each of the eight attached hex bits

129702-Q8-L30C02

UPC: 689228386808

- 139g (110mm)

RC3542 ST4198

CeramicSpeed OSPW System, Compatible with Shimano 9100/8000, Standard - Black Other An 8mm hex head hasProven to be the fastest pulley system, chosen by many of the world's leading cycling teams and professional triathletes Optimized tooth designs offer 3 5 times longer life than standard OE pulleys Standard: low drag with hardened steel races and ceramic ball bearings Coated: metallic layer that covers bearing races making them 75% harder than steel. Even lower friction and highly resistant to corrosion 9100 9150 8000 SS 8050SS is not compatible with