... 2.Diameter:3+1/2" 3.Drive control:SERVO DRIVER Computerized Socks Knitting Machine|Computerized Socks Making Machine Refer to the product line ... loop,half pile loop,partial pile loop,pile loop with jacquard,elastic with Y heel,,multilayer rib collar,additional thick in sole ... motor to adjust yarn tension.3.Yarn channel triangle controlled by the electronic air compressor.4.Adopting sensor device to ...