All metal materials, galvanized surface, anti-wear, anti-oxidation, durable. Easy to assemble and disassemble by hand. Precision valve with 1/4'' male to 3/8'' male threaded adapter. This easy-to-install metal adapter is used to connect two photographic equipment. They have different sized male plugs (1/4" and 3/8"). The conversion screw is best for your camera and other accessories! Covers most use cases. This camera screw adapter is suitable for most SLR cameras/tripods/monopods/ball heads/flashlight mounts/shoulder camera accessories. Strong trigger force, easy to install spindle with 1/4" to 3/8" threaded adapter Made of metal, galvanized surface, anti-wear, anti-oxidation, durable A variety of photography accessories can be connected, such as studio lights, hot/cold shoe adapters Suitable for 1/4" or 3/4" tripods 8", monopods, quick release plates, umbrella stands, headlights and other photographic equipment. Type: screw for lamp holder Material: metal Quantity delivered: 2 pieces Size: 2.8 inches / 7 cm Weight: 5.8 oz / 164 g Applicable products: digital camera tripod head Product features: adapter screw Specifications: set iron screw 2p