Comparison : Item # 693, 600 Series Miniature / Instrumentation Ball Bearings
Item # 623, 600 Series Miniature / Instrumentation Ball Bearings
Item # 694, 600 Series Miniature / Instrumentation Ball Bearings
Item # 684, 600 Series Miniature / Instrumentation Ball Bearings
Item # 624, 600 Series Miniature / Instrumentation Ball Bearings