Product Name: Overlock Blade Knife Upper and Lower Set Material: Steel Package Size (L x W x H): 74mm x 51mm x 3mm / 2.91in x 2.01in x 0.12in Weight: 7g / 0.25oz Color: Silver Compatible Brands: Suitable for Singer S14-68 S14-69 S14-77 S14-78 S14-79 and More. Suitable for Pfaff brand Element 1450OL and More. Package Contents: 1 x Upper Knife 1 x Lower Knife. Professional Results: Achieve precise and clean cuts with this set of overlock blades. Whether you're working on delicate fabrics or heavy materials, these blades deliver professional results, contributing to the overall efficiency of your sewing projects. Perfect Compatibility: Suitable for S14-68, S14-69, S14-77, S14-78, S14-79, and more. Additionally, they are suitable for Pfaff brand Element 1450OL and other compatible overlock sewing machines. Durable Steel Construction: Constructed from high-quality steel, these replacement knives are built to withstand the rigors of serging tasks. The durable material ensures longevity and consistent cutting performance, making them an essential accessory for your serger. Easy Installation: Designed for user-friendly assembly, these blades ensure a quick and straightforward setup, allowing you to effortlessly enhance the cutting precision and efficiency of your serger machine. Complete Set: This replacement set includes both the Upper and Lower knives, providing a comprehensive solution for your serger machine maintenance. The straightforward installation process allows you to effortlessly replace worn-out or damaged knives, restoring your serger's cutting efficiency with minimal downtime.