Features: 1/4inch camera installation extension rod, extension rod for driving recorder and action camera, compatibility with 1/4 threaded camera accessories. Double 1/4-20 thread, with male thread+1xfemale thread at both ends, can seamlessly extend between tripods, car mounts, or camera arms. Quality iron, with reasonable structure and long service life, it is the best alternative to plastic adapters. Suitable for any DSLR camera tripod, monopod, microphones, telescope, lens board, lamp holder and more. This extension rod is with 2 functions: 1/4 female screw hole to 1/4 male screw extension rod or 1/4 female screw hole to 1/4 female screw hole connection rod, 2-in-1 photography stand. Specifications: Name: 1/4 internal thread to 1/4 external thread extension rod Material: Iron Length: 10cm/20cm/30cm (optional) Size: approx. 10cm/3.94inch, 20cm/7.87inch, 30cm/11.81inch Package Includes: 1 Piece 1/4 Internal Thread to 1/4 Internal Thread Extension Rod 1 Piece 1/4 External Thread to 1/4 External Thread Adapter note: Please allow 1-2cm errors due to manual measurement. Please allow for slight color differences due to different display resolution.