Aluminum die-cast, V-struts, attaches to dropout and tool-free to all seat posts (Ø 25-32 mm), SB-packaged, with spring flap, with corrosion protection (from the automotive sector) which largely prevents penetration by salt water, blistering and edge corrosion, load capacity up to max. 25 kg, not suitable for child seats, black Rear mounting type Item Attachment dropout, seat post Features Spring flap Main color black Suitable wheel sizes 26 ", 28" Max. load capacity 25 kg