About these itemsThread and Stitch Flexibility: Offer various thread options (2/3/4 - thread in 336 model, 3/4 - thread in 4 - 434 model, 2/3/5 - thread in 5 - 535 model) with adjustable stitch length and width. Support multiple stitch styles like overlock, rolled hem, edging, and lettuce hem, suitable for a wide range of sewing tasks from simple repairs to detailed edge finishing and can handle different fabric thicknesses, including up to 6 layers of denim in the 336 model.High - Speed Performance: All models have a high sewing speed of up to 1200 ± 50 SPM (1250 SPM maximum), combined with relatively powerful motors (91W in 336 model, 112W in 4 - 434 and 5 - 535 models), enabling quick and efficient project completion.Durable Construction: The 4 - 434 and 5 - 535 models are built with an iron - and - plastic body, providing strength, stability, low vibration, and excellent wear tolerance for long - term use and cost - reduction.User - Friendly Design: Feature color - coded threading for easy setup. An adjustable presser foot and LED lighting (1W in 336 model, 2W in 4 - 434 and 5 - 535 models) ensure clear visibility and steady control when working with different fabrics. The 336 model also has a free arm for sewing sleeves and cuffs.Convenient Accessories: Come with accessory kits, foot pedals with power cords, user manuals, and test fabrics. Some models also include additional items like spool holders, needles, knives, and various wrenches.Key DifferencesItem Model Number: Each model (336, 4 - 434, 5 - 535) has its own unique features related to thread options, dimensions, weight, and included accessories.Thread Options: The 336 model offers 2/3/4 - thread flexibility, the 4 - 434 model has 3/4 - thread versatility, and the 5 - 535 model provides 2/3/5 - thread options.Rated Power: The 336 model has a 91W power rating, while the 4 - 434 and 5 - 535 models have a 112W power rating.Max Stitch Width: The 336 and 4 - 434 models have a max stitch width of 0.26 in / 6.5 mm, while the 5 - 535 model has a wider max stitch width of 0.34 in / 8.5 mm.Max Sewing Thickness: The 336 model can sew up to 0.16 in / 4 ± 0.5mm (6 layers of denim), while the 4 - 434 and 5 - 535 models can sew up to 0.14 in / 3.5mm.Specifications336Item Model Number: 336Sewing Speed: 1200±50 SPMRated Power: 91WStitch Options: 2/3/4 threadsMax Stitch Width: 0.26 in / 6.5 mmNeedle Type: 80/11, 90/14 (standard: 90/14)Stitch Length: 0.04â0.16 in / 1â4 mmMax Sewing Thickness: â¤0.16 in / 4±0.5mm (6 layers of denim)Presser Foot Lift: 0.16 in / 4 mmLED Light Power: 1WColor: WhiteProduct Size: 12.6 x 11 x 12.6 in / 320 x 280 x 320 mmNet Weight: 16.5 lbs / 7.5 kg4 - 434Item Model Number: 4 - 434Sewing Speed: 1200±50 SPMRated Power: 112WStitch Options: 3/4 threadsMax Stitch Width: 0.26 in / 6.5 mmNeedle Type: 90(14)#Stitch Length: 0.04â0.16 in / 1â4 mmMax Sewing Thickness: 0.14 in / 3.5mmLED Light Power: 2WColor: WhiteProduct Size: 10.24 x 10.63 x 10.63 in / 260 x 270 x 270 mmNet Weight: 17.75 lbs / 8.05 kg5 - 535Item Model Number: 5 - 535Sewing Speed: 1200±50 SPMRated Power: 112WStitch Options: 2/3/5 threadsMax Stitch Width: 0.34 in / 8.5 mmNeedle Type: DPX590/14Stitch Length: 0.04â0.16 in / 1â4 mmMax Sewing Thickness: 0.14 in / 3.5mmLED Light Power: 2WColor: WhiteProduct Size: 10.24 x 10.63 x 10.63 in / 260 x 270 x 270 mmNet Weight: 17.97 lbs / 8.15 kgPackage Content3361 x Serger Sewing Machine1 x Standard Presser Foot (pre - installed)1 x Accessory Kit1 x Dust Cover1 x Waste Bin (pre - installed)1 x Foot Pedal with Power Cord1 x User Manual1 x Test Fabric4 - 4341 x Serger Sewing Machine4 x Spool Holder1 x Brush3 x Needles (90/14)1 x Upper Knife1 x Lower Knife1 x Tweezers1 x Spanner1 x Multifunctional Hexagon Wrench5 x Small Hexagon Wrenches1 x Small Flathead Screwdriver1 x Needle Plate for Four - Thread Rooled Hem1 x Spring1 x Foot Pedal & Power Cord Combo1 x User Manual1 x Test Fabric5 - 5351 x Serger Sewing Machine5 x Spool Holder1 x Brush3 x Needles (DPX5 90/14)1 x Upper Knife1 x Lower Knife1 x Tweezers1 x Spanner1 x Multifunctional Hexagon Wrench5 x Small Hexagon Wrenches1 x Small Flathead Screwdriver1 x Foot Pedal & Power Cord Combo1 x User Manual1 x Test Fabric