End caps and axles for our Halo MT 6Drive (formally called Spin Doctor 6D), FAT 6Drive and RL II (Ridgeline II) rear hubs.
 
Thread-on End Caps - (End Cones) 
QR type 5/10mm frames use: HUHAM6RAQ
SD6/MT6D/RL2/Fat Axle QR Axle Ends Rear - QR5/10mm x 135/141/170/190mm.
12mm Regular Thru-axle frames (with 3.5mm location recess per side) use: HUHAM6RA4
SD6/MT6D/RL II/Fat Axle Ends Rear - 12x142/148/177/197mm. Regular Thru-axle type.
12mm Non Recessed (plain) Thru-axle frames use: HUHAM6RA3
SD6/MT6D/RL II/Fat Axle Ends, Rear - 12x135/141/170/190mm Thru-axle - no recess type.