Used on injection molding for fixing tightly. No need to counter or count the boss hole as the insert has a guide pilot. All nuts are made of high quality brass, which has high hardness, no deformation, durable and reliable for long time use. sink the hole. Can be ultrasonically or heat installed in tapered bore wire, or molded during injection. Package Content: 150 x Nutonly Embedding The above package content, other products are not included. Render: Light shooting and different monitors may cause the color of the item in the picture a little different. Measurement error allowed is +/- 1-3 cm.