Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number B3-3LB found under Hammer Hand by Estwing Mfg Co Inc. The National Stock Number assigned to this part is 5120016201002, 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 B3-3LB.