Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number R-9900-60 found under Tool Kit Electronic System by Cole Parmer Instrument Co. The National Stock Number assigned to this part is 5180013497373, and the Federal Supply Class is 5180 Sets Kits And Outfits Of Hand Tools. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like R-9900-60.