Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number MG-S281-4R found under Square Combination by General Tools Manufacturing Co Llc. The National Stock Number assigned to this part is 5210013684505, and the Federal Supply Class is 5210 Measuring Tools Craftsmens. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like MG-S281-4R.