Function:1. Made of good quality stainless steel, has high hardness, wear resistance, and durability. 2. You can use a metal cutting blade according to your own needs to cut the 8mm diameter stainless steel hex nut with a locking ring into different lengths. 3. Each end of the hex shaft has an M4 threaded hole with a thread depth of 14mm, and there is a groove for clamping the spring on one end of the shaft. 4. The outer diameter is 8mm, the appearance is a hexagonal shape with a 7mm flat distance, which is a perfect combination of a circular shaft with a diameter of 8mm and a hexagonal shape with a 7mm flat distance. 5. With the advantages of two shafts of circular and hexagonal, it can be used with other robot parts with a hexagonal hole. 6. Effectively prevents parts from rotating and sliding on hex shafts, making the force on the parts more average, greatly increasing friction and transmission or drive efficiency. 7. Can be used as a drive shaft accessory for intelligent robots, can also be applied to lathe equipment and engineering equipment. Specification: Item Type: Long Rod Nut Compatible With: For Gobilda, For TETRIX Material: Stainless Steel Thread Hole Depth: Approx. 14 mm / 0.6 in Purpose: Used as a drive shaft accessory for intelligent robots, also applicable to lathe equipment and engineering equipment. Package List: 5 x Long Rod Nut Note: 1. Match the design size when using. 2. When cutting your design size, you should work under professional guidance to ensure safety.