classic Profile Mini cassette hub with disc brake rotor interface - - - - - 36h RHD only made in the USA two precision 6903 sealed bearings in hub four precision 6802 sealed bearings in driver four individual pawl/spring engagement mechanism with CNC machined driver - - - - - AL (aluminum) and CROMO (cromoly) female axles accept 3/8" x 16 tpi bolts with the following options: a) cromo Socket bolts with polished AL Volcano washers *b) titanium Socket bolts with polished AL Volcano washers - add $35 *c) cromo Button bolts (full 3/8" or 3/8" with integrated 14mm adapter)d) cromo Button PEG bolts (3/8" with integrated 10mm long 14mm adapter for peg / dropout)e) titanium Button bolts (full 3/8" or 3/8" with integrated 14mm adapter) - add $35f) cromo Hex bolts (full 3/8" or 3/8" with integrated 14mm adapter)g) cromo Hex PEG bolts (3/8" with integrated 10mm long 14mm adapter for peg / dropout)- bolt chart available as you click through product images- all bolts accept 8mm Allen key - “Hex” bolts also accept 17mm wrench or socket- alloy or steel hub cone spacers* Volcano washers, they’ll be polished unless otherwise noted in “order comments”- please include any instructions in the “order comments” if you want an axle / bolt configuration not listed in the choices above (example: one Hex bolt and one Hex PEG bolt on a hub, etc.) - - - - - 14mm male axle options:heat-treated GDH (gun-drilled hollow) cromo with alloy or cromo axle nuts heat-treated solid cromo with alloy or cromo axle nutstitanium GDH (gun-drilled hollow) with alloy or cromo axle nuts add $90 - all male axles have alloy non-drive side cone spacer - - - - -