[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 temperatures, provides strong support, easy to dissipate heat, easy to assemble, fixed specifications, allows flexible combination [Features] - DIY combination for batteries, compatible with 21700 lithium batteries; unique design and durable frame provide reliable protection for your lithium battery pack [Advantages] - Includes connection slots, various sizes can be linked together, secure fit, sturdy construction, no need for additional connectors; passes vibration testing [Application] - Replace general adhesive with a professional battery holder; easy to assemble, more securely connected, and simple to maintain; ideal for battery pack assembly 21700 Bracket Specifications: Triple Size: 72x23.4x8.8mm Material: Plastic Color: Black Package Contents: 50 * 21700 Lithium Battery Brackets Note: Light and display differences may cause slight color variation between image and actual item. Measurement error allowance: +/- 1-3cm.