This conversion plate features a 20mm inner hole, making it a compatible accessory for portable equipment. Crafted from high-quality, durable aluminum with chrome plating, CNC machining, and a refined sandblasting finish. Designed to enhance performance when used with your speaker setup. Precisely machined hole (20mm inner diameter) for use with LP turntables, vintage record players, and gramophones to secure the player in place. Compact and lightweight, space-saving design. Item: Conversion Arm Weight: 95g Color: Silver Material: Aluminum Size: Inner hole: 20mm / 0.79in Package Contents: 1 x Audio Speaker Adapter Plate Note: The package includes only the items listed above. Other accessories are not included. Note: Lighting effects and monitor settings may cause slight variations in color between the image and the actual product. Measurement may vary by +/- 1-3cm due to manual measurement.