HO 28"/110 wheel, 0.120" bore (for use with insulator 804-9)
$2.50

HO 28"/110 wheel, solid stainless steel wheel with a 1.5mm bore.

Variations:
98000606 1.5mm bore
93000508 2.0mm bore
93000506 3/32"/2.4mm bore 
93000507 0.120" bore (for use with insulator) (this listing)