Spare Adaptor cones to allow Spin Doctor front hub to change from; 9x100mm spaced QR fitting to; 20x110mm Through Axle type use.20mm T-axle cones. Blk CNC alloy. Pr.Note - these are replacement spares - as the Spin Doctor hub inc. these items when purchased new.Note: There are 2 types... ;Mk1 (earlier hubs) have offset bearings with 2 different sized spacers: Disc Side: 28mm & Non-Disc side: 18mm) Mk2 (later - mid 2006 onwards) are more equally spaced. Disc side: 16mm deep, Non-Disc side: 18mm deep.