The Flip bracket offers our new generation fit range paired to the classic Profile Design spring loaded arms allowing the armrests to sit up, out of the way when not in use.Pairing this bracket with the ergo armrest offers industry leading fit options and greater comfort,With the 50a extensions this aerobar encourages a neutral wrist angle and is designed to be super comfortable,The Flip/Ergo platform is designed to give riders the freedom to find an optimal low stack position with the ability to hold the bar tops when climbing,There are 80 distinct position options achievable just by moving the armrests,Fit information: Armrest Offset -85mm to -17.5mm in 7.5mm steps, Armrest Width 112mm to 280mm in 18.5mm steps, Armrest Stack 40mm,Weight: 587g.