Alligator clips are made of high-quality material. Rating: CAT III 1000V 32A. The alligator clip has a built-in strong spring for stronger grip and improved conductivity. Maximum opening is 20mm, with no deformation after repeated use. Safe and reliable: The electrical jumper alligator clamp features a fully insulated PVC sheath and an internal strong spring. Ensures better grip and conductivity. Wiring is convenient, simple, and fast. Widely used: Compatible with 4mm standard banana plug. Ideal for various electrical engineering applications, voltage testers, and battery fast connections. Product Name: Insulated Safety Test Alligator Clips Operating Temperature: -40C to +120C Connector: Compatible with 4mm Banana Plug Rated Current: 32A (max) Maximum Voltage: 1000V Color: Red and Black Material: Plastic Package Includes: 10 x Alligator Clips (5 Red + 5 Black) Note: Light reflection and different displays may cause slight color variations between the image and the actual item. Measurement may vary by +/- 1-3cm.