PPW 12053 Brass Sleeve size 2mm ID X 2.4mm OD X 7/32" long 4 ea) Used to convert 2.4mm ID flywheels to fit 2mm OD motor shafts package of 4

#12053 - Brass Sleeve -size  2mm inside diameter (ID) X  2.4 mm OD outside diameter X 7/32" long (4 ea)

Used to convert 2.4mm ID flywheels to fit 2mm OD motor shafts,

made to mount 2.4mm flywheel onto 2mm motor shaft

These do not fit Athearn  3/16 ID RTR flywheels