This is a great record stabilizer for LP record player, which efficiently keep the disc from shaking and reducing vibration with stabilizing rotational speed. Perfect for maintaining stability, and improving acoustic quality. For eliminating vibration, stabilizing rotational speed, and maintaining horizontal level of turntable. Realistic sound reproduction and lower noise provide you a pure and excellent enjoyment in music. Spindle hole is suitable for 7mm diameter of spindle, fit well with most of exist turntable. Built-in high precision bubble level, for testing weather the working is on the level and showing you the rotation speed of the vinyl disc. Function: 1. For record stabilizer. 2. To test the speed of record players. 3. To test the level of record player, cabinet and speaker. Specification: Color: Black Material: Aluminum Alloy Hole Diameter: 7.2mm(±0.1mm) Max Diamter: 78mm Height: 41mm Package Contents: 1 * LP Vinyl Record Turntable Stabilizer Only the above package content, other products are not included. Note: Light reflection 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.