Round three-jaw oil filter wrench for automotive use - Function and design A round three-jaw clamp that securely grips automotive oil filters for reliable removal and installation. The three-jaw design provides even clamping pressure to minimize damage to filters. - Clamping diameter Clamp range: 75 to 130 mm. Suitable for standard automotive filters within this diameter. - Drive and tool compatibility Compatible with 1/2 inch drive tools (12.5 mm). Works with 3/8 inch and 1/2 inch L-shaped keys and ratchets for flexible operation. - Application Used to disassemble and install three-jaw automotive oil filters. - Use scenarios 1) Home garage: perform routine oil changes on passenger cars with filters in the 75–130 mm range. 2) Repair shop: service light trucks and SUVs that use three-jaw filters within the same diameter range. 3) On-site maintenance: use a standard 1/2 inch drive ratchet or L-shaped key to quickly loosen or tighten filters in tight or hard-to-reach locations.