68WR500 vs 68WR500-122B vs 68WR500K

 
PartNumber68WR50068WR500-122B68WR500K
DescriptionRes Cermet Trimmer 500 Ohm 10% 0.5W(1/2W) 20(Elec)Turn 2.29mm (9.53 X 6.22 X 11.05mm) Pin Thru-Hole BoxTrimmer Resistors - Through Hole 3/8" Squ 500K 10%
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