Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number IS12-28L found under by 31 Mile Equipment Co. The National Stock Number assigned to this part is 5120014501572, 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 IS12-28L.