Self Tapping screw is available in AB type and B Type threads with the option of full thread and half thread. Size : For all, you can send me the size info you need General Introduction ： Jiaxing Meiming Hardware Co., Ltd.is a collection of research , manufacturing, sales and service for a professional hardware&fastener supplier. The 1st factory was founded in 2001, located in fastener production base ----jiaxing,china, where is distance of Shanghai and Ningbo port around 100 kilometers , easy to transport fasteners&hardware all over the world by sea . Wechat :YAO585525 E-mail :1429526799@qq.com TEL:0573-82297290