Using a lightweight forged alloy for the arms, bolted to Ergal 7075 4mm alloy chainrings gives a sub 600g chainset. The axle profile is compatible with JIS squared bottom bracket with a 68mm shell width and with an axle length of 107mm.
 
Arms: 135 BCD Aluminium, CNC, Forged, 170mm
BB: JIS 107mm(not included)
Rings: Aluminium, CNC, 48t
Weight: 577g (46t 170mm)