Calling all serious sewists, leatherworkers, and crafters! If you're working with a walking foot sewing machine (like many industrial or heavy-duty home machines), this 10-pack of Groz-Beckert 135x17 needles is exactly what you need. Also labeled as DPx17, these are Size 18 needles, which are perfect for tackling thick, tough materials. We're talking about leather (both genuine and faux), heavy canvas, multiple layers of denim, vinyl, upholstery fabric, and even some plastics. The 135x17 style is specifically engineered for the unique mechanics of walking foot machines, ensuring smooth feeding and preventing skipped stitches. Groz-Beckert is a trusted, top-tier brand in the sewing industry known for superior sharpness and durability. Don't burn out your machine or get frustrated with broken needles on a big project – use the right tool for the job. Having a 10-pack means you've got plenty of spares on hand for when it's time to change to a fresh, sharp point. Essential supplies for your workshop.