Black ALL THREAD GRUB / SET SCREWS M3 [SR] 3mm ~ 25mm GRUB M3 We all can always use more set screws / grub screws!! SR came to the rescue with their screw packs. These high quality black M3 ALL THREAD screws. You can select what measurement you want in length. These are great so attaching misc items as well as steering stoppers! PINIONS for the motors are usually 3MM long. Comes as a set of 6