Shouldered Winding checks provide the perfect "capâ€Â to any size 16  threaded barrel. They are the best finish for the ends of trimmed barrels in SK2 applications but also fit the threaded end of any size 16  single piece seat. A good selection of WCS checks is essential to shops that need to keep workflows moving. Available in size 16 and 17 with IDs from 7 to 15mm.