Features: These knurled threaded nuts can be widely used in injection molding for firm fastening. It can be installed by ultrasound or heat in a blind hole, or molded during injection. No need to ream or countersink the boss hole as the insert has a pilot guide. Made of brass, good thermal conductivity and heat resistance. It can be widely used in injection molding or 3D printing for waterproof fixing. Specifications: Material: Brass Packing box size: 17.6 * 10 * 2.3 cm Size: 30 x M2x4x3.5 mm 30 x M2 x 6 x 3.5 mm 30 x M2 x 8 x 3.5 mm 20 x M2 x 10 x 3.5 mm 30 x M3 x 4 x 5 mm 30 x M3 x 6 x 5 mm 20 x M3 x 8 x 5 mm 20 x M3 x 10 x 5 mm 30 x M4 x 4 x 6mm 20 x M4 x 6 x 6mm 20 x M4 x 8 x 6mm 15 x M4 x 10 x 6mm 15 x M5 x 6mm 7mm 10 x M5 x 8 x 7mm < br/> 10 x M5 x 10 x 7mm Package Content: 330 x Threaded Knurled Nuts < br /> 1 x storage box Guaranteed: < br/> We are committed to providing you with the best service, If you have any problems during use, contact us without hesitation