Features: Insulation shell which can quickly remove the battery, then insert a new battery, which can be fixed firmly. Easy and convenient. Ideal for batteries installed in tight spaces. Quick release car battery connectors. These are for Conventional round terminal batteries only. Specifications: Material: plastic and metal Color: red and blue Quantity: 1 pair Inner diameter (positive): 19mm Inner diameter (negative): 17mm Package Contains: 1 * pair of battery terminals (one is red and the other is blue) Purpose: Providing customers with quality products and services is our engagement. To meet customer needs is our unremitting pursuit. Your feedback and comments: Your comments and reviews are our greatest motivation to provide quality products. We look forward to your comments and suggestions.