It'll be a big key in the middle, probably 14mm+ as it looks like they can be converted to 14mm threaded axle, will be 12 point rather usual 6 looking for extra axle clearance like the ring part of most spanners.
No chance of getting an Allen that size in with the axle. Do I need to somehow knock out the axle first?
@snottyotter started
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It'll be a big key in the middle, probably 14mm+ as it looks like they can be converted to 14mm threaded axle, will be 12 point rather usual 6 looking for extra axle clearance like the ring part of most spanners.