HB 3727-1986 铆枪用弯窝头（用于ＧＢ ８６８－７６）

HB 3727-1986 I don't understand the specific context or background of the question, so I cannot provide a translation that fits your question. But generally speaking, a "Bending wok head" (for GB 868-76) is commonly used for welding tools such as a riveting gun. If you have any other specific context or background, I would be happy to provide a more accurate translation