Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 53B20381-5620 found under Reamer Hand by Mobile Air Material Area. The National Stock Number assigned to this part is 5110002944600, and the Federal Supply Class is 5110 Hand Tools Edged Nonpowered. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 53B20381-5620.