Size and quantity: you will receive 4 pieces serger blades in the package, and the hook blade is approx. 3.8 x 1.3 cm 1.49 x 0.51 inch, the diagonal blade is about 4.1 x 0.8 cm 1.61 x 0.31 inch, the replacement of both the upper and lower blade will ensure a smooth skilled fabric cuttingSturdy material: our sewing machine blades are made of metal material, strong and sturdy, good quality, can be applied for a long time Accurate angle blades ensure smooth sewing and good cuttingCompatible models: PL1500, PL2000, 925D, 935D, 929D, 1034D and 1134DW, 1634D, 2034D, 3034D, 925D, 929D, DZ123, DZ1234 Ideal for upper knife XB0563001 and lower knife X77683001Convenient to use: the serger knife overlock blade is easy to install and trim the fabric very easily New serger blades are easy to install and they're pointed and trim your fabric beautifullyMulti purpose: this household overlocker knife set is compatible with brother 1034D accurate angle blade to ensure smooth sewing and cutting, reliable design Suitable for replacing your existing blades