The StitchMaster Duo includes two metal needle clamps designed for side load sewing machines. Each clamp is precisely manufactured to ensure compatibility with various models, including those from brands such as Kenmore, Riccar, Necchi, and Singer. These replacement needle clamps are suitable for many straight stitch style machines, including models like 651, 158.480, Morse 100, 195, 2400, 2500, 4000, 4100, 4700, 5600, 7400, Mz, Moz, Swa-1000, Swa-2000, Necchi 537, Riccar 608, Sz702, Rec5900, and several Singer models such as 15-30, 15-84, 15-86, 15-87, 15-96, 15-97, 27, 66 Cl, 99k, 127, 128 Cl, 185, 192k3, and Ha-1. Made from durable metal, these clamps are essential for maintaining proper needle positioning and sewing performance. If unsure about compatibility, technical support is available; please provide your machine brand and model for assistance.