Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 042-8213 PARTS KIT B1 found under Parts Kit Test Set Electrosurgical Apparatus by Biotek Instruments Inc. The National Stock Number assigned to this part is 6545013122837, and the Federal Supply Class is . Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 042-8213 PARTS KIT B1.