This Spider is a 104/64 bolt pattern with 4 arms, and is designed for optimum chain line with the Profile Outboard BB. It's made from 7075 aluminium, with a heat treated 4140 CrMo spline insert. It can be used with up to three front chainrings. We have polished, black, purple, and blue in stock right now, with more colours arriving soon.CHAINRING BOLTS NOT SOLD BY PROFILE