BRAND NEW BOX OF 50 DISCS! This 3M Cubitron II Multi-Hole Hook & Loop is a must-have for any DIY enthusiast or professional mechanic. With a size of 3 inches and a grit of 400, this sanding disc is perfect for removing rough surfaces and preparing them for bonding or coating. The pack includes 50 pieces of the purple-colored disc, making it ideal for large projects. The manufacturer part number is 31464, and it is compatible with a variety of automotive tools and supplies.