The Solano is compatible with Centaur carbon/Veloce/Mirage compact Ultra-Torque cranks. CNC machined. The 5th arm is slightly offset for crank fixing. The 5th bolt hole has no recess for a bolt head as this bolts straight into back of crank.
TAX inners: all Compact Ultra/Power-Torque cranks
TAY outers: Carbon Compact square taper and Record carbon/Chorus
carbon/Centaur alloy compact Ultra/Power-Torque cranks
TAW outers: Centaur carbon/Veloce/Mirage compact Ultra/Power-Torque cranks

Material : 7075 T6 Aluminium
Outers : 46, 48, 50, 52, 53T
Inners : 34, 36, 38, 39, 42T
PCD : 110 pcd Campagnolo offset arm
Colours : Black 
Weight : 74g (48T)