Neewer 10pieces 1/4" to 3/8" Metal Screw Mount Converters Adapter for Tripod and Quick Release Plate Main material: aluminium alloy Thread Adapter with 1/4" thread to 3/8" thread. Accept 1/4 and 3/8 screw, can be widely used in flash mount or ball head bracket. 10 pieces pack Net Weight: 0.5 oz