Features: Premiun Quality: It is made of high quality ABS plastic, which is light-weight, fire-proof and stable. Free Combination: Battery holder has a card slot on the edge, you can freely combine the battery. Excellent Heat Dissipation Performance: There is enough space between the rack layers for ventilation and heat dissipation. Great Organizer of Battery: Must-have accessories for 18650 batterys. Professional Certification: The product has obtained RoHS Certification successfully. Specifications: Material: Fire-Proof ABS Size: 58x19.5x8.0 mm/2.28x0.76x0.31 inches Approx. Hole Diameter: 18.4 mm/0.72 inches Approx. Center Distance: 19.5 mm/0.76 inches Approx. Height: 8.8 mm/0.34 inches Approx. Color:Black Note: 1.Please allow slight inaccuracy due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes: 10 Pieces Bracket Per Set