ITEM NAME:2PCS 1/4" 1/4" Male to 1/4" Male Threaded Screw Adapter A4G1 2PCS 1/4" 1/4" Male to 1/4" Male Threaded Screw Adapter A4G1 2 Precision made 1/4" to 1/4" Stainless Steel (metal) screws,Easy to use. This is a universal adapter spigot stud for the studio use . Approx. Total length:19.7mm Approx. diameter:16mm 2 pieces pack . This is 1/4" 1/4" Male to 1/4" Male Threaded Screw Adapter. Suitable for the connection of a variety of 1/4-20 screw holes. Convenient and practical to use Durable Material: Stainless Steel. Package Includes: 2 x 1/4-20 Male to 1/4 -20 Male Thread Screw Adapter Note:Light shooting 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.