Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 9904 found under File Rotary by Dremel Mfg Co. The National Stock Number assigned to this part is 3455015713853, and the Federal Supply Class is 3455 Cutting Tools For Machine Tools. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 9904.