These are  M3x2.5 set screws
Size(mm): M3 x 2.5 to M30 x 400
Standards: DIN913, DIN914, DIN915, DIN916
Grade:8.8 -12.9 for alloy steel
Material: SUS304, SCM435, alloy steel
Surface: zinc plated,black,Colorful galvanization,plain
We can produce that according to your requirements (drawings or samples).if you want to get any more,please contact us!