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.