Feature: 1. Made of good quality stainless steel, possess high hardness, wear resistance and durability 2. You can use a metal cutting blade according to your own needs to cut dia 8mm stainless steel hex nut with circlip into different length 3. Each end of the hex shaft has a M4 thread hole with a thread depth of 14mm, and there is a slot for clamping spring at one end of the shaft 4. The outer diameter is 8mm, the appearance is a hex shape of 7mm flat spacing, which is a perfect combination of a circular axes with diameter of 8mm and a hex shape with plane spacing of 7mm 5. With the advantages of two axes of the circular and the hex, can be used with other robot parts with a hexagonal hole 6. Effectively prevent parts from rotating and slipping on hex axes, making the force of the parts more average, greatly increasing friction and transmission or driving force efficiency 7. Can be used as the driving shaft accessories of intelligent robot, also can 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. 14mm / 0.6in Purpose: Used as the driving shaft accessories of intelligent robot, 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 you cut your design size, you should operate under professional guidance to ensure safety.