Features: Quality iron, with reasonable structure and long service life, it is the best alternative to plastic adapters. With complete and deep thread, no burrs, and provides excellent grip strength, enabling stable and safe clamping, making it easy to install and disassemble. Available in three lengths of 10cm/20cm/30cm, with a diameter of 15mm, it can be used as a spare part for corresponding screws in equipment or as a substitute for camera screws. Suitable for any DSLR camera tripod, monopod, microphones, telescope, lens board, lamp holder and more. Multifunctional, this extension rod is with three functions: 3/8 to 3/8 fixed rod; 1/4 screw hole to 3/8 screw adapter extension rod; 1/4 screw hole to 1/4 screw hole, 3-in-1 photography stand. Specifications: Material: Iron Length: 10cm/20cm/30cm(optional) Size: approx. 10cm/3.94inch, 20cm/7.87inch, 30cm/11.81inch Screw Type: 3/8 External Thread to 3/8 External Thread Screrw Adapter Package Includes: 1 Piece 1/4 Internal Thread to 1/4 Internal Thread Metal Extension Rod 2 Piece 1/4 External Thread to 3/8 External Thread Screw Adapters note: Please allow 1-2cm errors due to manual measurement. Please allow for slight color differences due to different display resolution.