Die-cast aluminum, V-struts, attaches to dropout and tool-free to all seat posts (Ø 25-32 mm), blister-packed, 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 Article mounting dropout, seat post features spring flap main color black suitable wheel sizes 28 ", 29 " max. load capacity 25 kg