Features: Application: Nab hubs, for 1/4 5inch reel to reel tape, outer diameter 47mm, inner diameter 8.2mm, thickness 10mm. Replacement: Used to replace reel to reel tape's old, aged controllers enhances the performances of the device. With Mounting Screws: Reel to reel tape controller includes mounting screws to secure hold it in place for easy access to replacement part. Durability: Nab hub is from aluminum block with hard anodized finish to harden the surfaces of aluminum for long service life. Easy To Use: The controller is small in size and light in weight, not take up too much space, easy to remove, convenient to use. Specifications: Item Type: Reel To Reel Tape Controller Material: Aluminum Alloy Color: Silver Outer Diameter: about 47mm/1.85in Thickness: about 10mm/0.39in Inner Diameter: about 8.2mm/ 0.3in Suitable: For 1/4 5inch Reel to Reel Tape Package Includes: 1PC Reel to Reel Tape Controller 6PCS Screws note: Due to the problems of lighting effects, there will be certain tolerances in the product, please understand. The error of manual measurement of the size is within the normal ranging of 0-2cm.