Easy seat post adjustment for when you want to drop your post, share a bike, or pack your bike down for travel. Made form aircraft grade aluminium and with Wolf Tooths renowned precision-engineering at its Minneaopolis facility. Key Features: 28.6mm38.6mm sizesMachined from 6061-T6 aluminiumBronze bushing for smooth lever actionStainless steel bolt with spherical washerSafe to use with aluminium, titanium and carbon framesWeight: 28.6mm, 34g; 29.8mm, 34.5g; 31.8mm, 35g; 34.9mm, 36.5g; 36.4mm, 37g; 38.6mm, 37.5gTorque spec: 6 Nm maxMade in the USA Compatibility: (Clamping Diameter) 28.6mm/29mm29.8mm/30mm 31.8mm/32mm34.9mm/35mm36.4mm/37mm38.6mm/39mmClamping height: 11mmNot compatible with Ibis bike frames.