1. Precision manufacturing: The external and internal thread adapters of these cameras are manufactured in standard sizes, which are suitable for most photographic equipment. 2. material: Most camera screws are aluminum alloy, 3/8 inch external thread to 1/4 inch internal thread is brass, rust-proof and strong. 3. Multifunction: All these camera screw adapters have different uses, they are widely used in camera/tripod/monopod/ball /flash/shoulder mount and other camera accessories. 4. If you are an advanced photographer, you will know how important it is to have such a universal set of photographic components. They will help you solve many photography problems. Material:Aluminum alloy colour:Silver Package Contents: 10 x 1/4 inch internal thread to 3/8 inch internal thread nut 5 x 1/4 inch external thread to 3/8 inch external thread 5 x 1/4 inch external thread to 1/4 inch external thread 5 x 1/4 inch external thread to 3/8 inch external thread Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.