Heli-Coil SAE Thread Repair Kit - 5528-4 Part #: 5528-4 Line: HEL Heli-Coil SAE Thread Repair Kit Manufacturer's Defect Warranty Material: Stainless Steel Quantity: 12 Thread Direction: Clockwise Length (in): 3/8 Inch Length (mm): 9.525mm Drill Size: 17/64 Inch SAE Or Metric: SAE Drill Bit Included: No Internal Thread Size: 1/4-28 Inch Rockwell Hardness: 43-50 Tap Included: Yes Tensile Strength (psi): 200,000 To 250,000 psi Show More Show Less