This is made of strong, rust-proof stainless steel + black anodized aluminum alloy for high durability. Can mount virtually anywhere you need like cameras, lights, umbrellas, hooks, shelves, glass plates, cross bars, and even other s. The 1/4" and 3/8" on the back of the clamp. You can mount other accessories via the 1/4'' or 3/8" thread, such as SMALLRIG Ball Head Arm 2070/2157/761. Jaw opens up to approximately 2.3 " (58mm), and minimum 15mm. You can clip it on anything less than 40mm thick and more than 15mm, it works best. Anti-slip and protection: The metal clip's rubber pads make it easy to slip down and could protect your item from scratching. Hawklock Patented QR Ecosystem: To improve your using experience, we released Hawklock Quick Release Ecosystem of well-designed and high-quality accessories, such as QR Plate 3513, Cold Shoe Monitor Mount 3514, 3515, NATO Monitor Mount 3601, Top Plate 3730, Base Plate 3731, Ball Head 3600. Product Description Universal Use The jaw opens up to approximately 58 mm, and a minimum of 15 mm. You can clip it on anything under 40mm thick and over 15mm, It works best. Multi-Functional Can mount virtually anywhere you need such as cameras, lights, umbrellas, hooks, shelves, glass plates, crossbars, and even other s. Anti-slip and Protection The metal clamp's rubber pads are not easy to slide down and could protect your item from scratches. Compatibility: Universal Package Include: 2 x Net Weight: 260g Package Size: 120x100x40mm Material(s): Aluminum Alloy