FB415,FB426,FB435,FB445 and FB455 threaded-rod gill boxes and FBL415,FBL426,FBL435,FBL445 and FBL455 chain gill boxes are a new generation of high-speed and efficient series gill boxes designed,developed and manu-factured by the DACHENG Textile Machinery Co.,Ltd on its own,on the basis of drawing on the features of the ad-vanced domestic and overseas gill boxes and considering the actual situation of our country. Model FB473 twistless roving frame is a finalized product developed by the company in 2000 and matches worsted series gill boxes.