[Parameters] - Series Mode: 3-Cell 21700 Lithium Battery Holder; Hole Diameter: 21.7mm/0.85 inch; Hole Spacing: 23.4mm [High quality] - The battery holder is made of plastic, which can withstand high drops, strong support, easy to dissipate heat, easy to combine, fixed specifications, free combination [Features] - DIY combination for batteries, can hold 21700 lithium batteries, design and smart solid frame can be a great protector for your lithium-ion battery pack [Advantages] - There are card slots , any size can be connected together, the match is firm, strong, no need to connect other devices through vibration test [Application] - Replace the traditional general adhesive with a professional battery holder, which is easy to combine, more firmly connected, and easy to maintain. It is the for battery combination 21700 Bracket Specifications: Triple size:72x23.4x8.8mm Material:plastic colour:black Package Contents: 50 * 21700 lithium battery bracket Only the above package content, other products are not included. Note: Light 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.