The SA 705581 CR-ST 40G PK50 from Field Tool Supply is a pack of 50 high-quality sanding discs designed for efficient surface preparation and finishing. Each disc features a 40-grit abrasive surface, ideal for heavy material removal and smoothing rough surfaces. Constructed from durable materials, these discs are compatible with standard sanding tools and machines, making them suitable for woodworking, metalworking, and automotive applications. The pack size ensures you have plenty of discs on hand for your projects, meeting industry standards for performance and reliability.