Material and technology: Made of High quality 304 stainless steel,It will not rust. CNC lathe fine machining,High end processing quality,The surface is bright and beautiful. Purpose: Suitable for 3-10 mm thick indoor and outdoor wall mounted billboards,acrylic picture frames and glass picture frames. Size: 0.5x1"(Diameter*Length) Package included: 8xPE expanded particles,8x304 stainless steel screw.