1High quality steel material makes it strong and durable with long service life. 2Exquisite workmanship, the surface is smooth without burrs. 3Simple installation and convenient use.Replacement for old or broken ones completely. 4Corrosion resistant, high strength and durable. 5A good sewing machine accessory that will make your work more efficient. Features: High quality steel material makes it strong and durable with long service life.Exquisite workmanship, the surface is smooth without burrs.Simple installation and convenient use.Replacement for old or broken ones completely.Corrosion resistant, high strength and durable.A good sewing machine accessory that will make your work more efficient.This lock hole is suitable for thin material, slippery material, knitted material, elastic material, leather material, thick material and hard material can not be used.Specification: Item Type:Buttonhole Attachment Material:Steel Lock Hole Maximum Length: 2.2cm / 0.87in Package List: 1 x Buttonhole Attachment 1 x Users Manual