51Pcs 1/4""-20 Brass Threaded Inserts Kit with Heat Set Tip This threaded insert kit includes 1/4""-20 SAE brass inserts along with a compatible heat set tip, providing a reliable solution for installing durable threads into plastic and 3D-printed components. Key Features Complete SAE Insert Kit Includes 50 pieces of 1/4""-20 threaded inserts plus 1 heat set insert tip for installation. Multiple Insert Lengths Features L8×D8 and L10×D8 sizes for flexibility across different material thicknesses. Durable Brass Construction Manufactured from high-quality brass for strong thermal conductivity, corrosion resistance, and long-term performance. Precision Knurled Design Clean threading and 45-degree knurling improve grip within plastic materials, enhancing torque resistance and holding strength. Efficient Heat-Set Installation Can be installed using a soldering iron, heat tool, ultrasonic method, or molding process. No Countersinking Required Built-in guiding design allows for easy and consistent installation. Wide Compatibility Suitable for PLA, PETG, ABS, PPS, PP, and other thermoplastics. Ideal for 3D printing, electronics, automotive plastic parts, and general repairs. Specifications Thread Size: 1/4""-20 (SAE) Material: Brass Quantity: 51 pieces (50 inserts + 1 tip) Sizes: L8×D8, L10×D8 Application: Heat set inserts for plastic Package Includes 50 × 1/4""-20 brass threaded inserts 1 × Heat set insert tip