High-quality 21918 Zinc-Plated Thread Adapter for versatile electronics setup Features an external diameter of 18 mm x 30 mm for a perfect fit Equipped with a female thread of 3/8' for wide-ranging compatibility Includes a male thread M8 x 12 mm for secure and reliable connection Durable zinc-plated finish with a sophisticated appearance Knurled surface ensures a firm grip for easy installation and removal