4pc 3/8 and 1/2in.Dr Socket Set for Specific Triangular Nut Profile Sizes : 6.5 | 7.5 | 13 | 26mm Special sockets for triangular head bolts necessary for TDI diesel pump internal repairs. Chrome Molybdenum. Specialized Design: Unique triangular profile sockets for precise fit on triangular head bolts. Durable Construction: Made from Chrome Molybdenum steel to handle high torque and resist wear. Versatile Compatibility: Includes both 3/8” and 1/2” drive sizes for use with a variety of tools. Essential for TDI Repairs: Perfect for repairing TDI diesel pumps and other diesel engine components. Comprehensive Set: Includes 4 sockets (6.5mm, 7.5mm, 13mm, and 26mm) to cover a range of triangular nut sizes. Professional-Grade Tool: Ideal for automotive technicians and DIY enthusiasts tackling diesel engine repairs.