Halo Spin Doctor 20mm Cones.Spare Adaptor cones to allow Spin Doctor front hub to change from;9 x 100mm spaced QR fitting to; 20 x 110mm Through Axle type use.20mm T-axle cones.BlackCNC alloy.Supplied as a pair..Note - these are replacement spares - as the Spin Doctor hub inc. these items when purchased new.Note: There are 2 types... earlier versions have offset spaced bearing on Disc side, and therefore require 2 different size cones, later hub models (mid 2006 onwards) have equal spacing left and right side.) Double check which you require before ordering.