4541 - 4-Ply adjustable collarete binder K710NA-B(S123B)-3/8" (38/10 mm) - suitable for Chain Stitch Machines like: Kansai Special DVK-1701F, DWK1802,… Pegasus W61, Rimoldi 261, Union Special 52800, 57700, Yamato DV-203, 1203, DW303, 1303,… With adjustable folding guides for smooth feeding. (equivalent: S123B3/8).