There are many factories around the world that manufacture parallel shank twist drill bit. Some popular manufacturers of parallel shank twist drill bit include Zhuzhou Lihua Cemented Carbide Co., Ltd.,Zhengzhou Best-Link Tradings. Co., Ltd.,Zhuzhou Lihua Cemented Carbide Co., Ltd.,Zhuzhou Lihua Cemented Carbide Co., Ltd.,Zhuzhou Lihua Cemented Carbide Co., Ltd.. There are also many other smaller manufacturers and specialized companies that produce parallel shank twist drill bit for specific industries or applications.