A strong, lightweight alloy post, licensed from Pivotal BMX Inc. Allows seat to be dropped lower than conventional posts . 3D forged 7075 alloy post with internal oval construction for strength. 10mm bolt tightening system, accessed through a slot in Pivotal Seat top (seat sold separately). 100g (24.5mm) / 258g (27.2mm)Item Specifications: Length: 330mm, Setback: Zero, Color: Black, Model Name: Pivotal, Material: Aluminum, Diameter: 27.2mm,