General description The 252 sanding rollers set includes 240 sanding belts and 12 mandrels designed for YMYNY rotary tools. It features sanding belts in three diameters (1/2", 3/8", and 1/4") with 80 pieces per size, and sanding rollers in the same diameters with 4 pieces per size, totaling 252 pieces. This set is ideal for sanding curved surfaces and edges, as well as polishing both soft and hard materials in various craft projects, artwork, and woodwork. Technical specifications Number of sanding belts: 240 Number of sanding rollers: 12 Sanding belt diameters: 1/2", 3/8", 1/4" Sanding roller diameters: 1/2", 3/8", 1/4" Grit: 120 Installation Easy installation with roller mandrels featuring a self-expanding rubber pad for a secure fit of the sanding belts. If the sanding belt comes off during use, ensure the roller is tightly screwed on and positioned close to the sleeve. Usage Wear professional safety goggles to protect your eyes from clumps that may form when the sanding roller