Get professional results on everything from heavy duty fabrics to lightweight knits with the Strong & Tough Serger from Brother. The extra hard high durability metal blade is manufactured of carbon steel that can cut evenly and smoothly even through multiple layers of denim. The heavy duty metal frame provides stability while serging at high speeds and durability for many years of extended use. The ST4031HD gives you the creative freedom to serge layers of denim difficult knits and other tough projects with ease.