Nevermind. I need a different lockring and tool to suit thru axle hubs.
http://m.ebay.co.uk/itm/Shimano-SM-HB20-Centerlock-Rotor-Lock-Ring-for-15mm-20mm-Through-Axle-Hubs
You need a BB tool to tighten that lockring.
No, I need a lockring for a thru-axle hub. Why they don't include one with 160mm MTB rotors that are quite likely to be used on thru-axle hubs, I don't know.
@edscoble started
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Nevermind. I need a different lockring and tool to suit thru axle hubs.
http://m.ebay.co.uk/itm/Shimano-SM-HB20-Centerlock-Rotor-Lock-Ring-for-15mm-20mm-Through-Axle-Hubs