Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 6551 found under Screwdriver Set Jewelers Swivel by Central Tools Inc. The National Stock Number assigned to this part is 5120011763887, and the Federal Supply Class is 5120 Hand Tools Nonedged Nonpowered. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 6551.