M5 30mm Length Low Profile Hex Socket Machine Screws (Pack of 50) Alloy Steel with Black Oxide Finish M5-0.8 Thread; 30mm Length 1.5mm Thick Head Perfect for use with 20mm aluminum extrusions like Openbuilds V-Slot/C-Beam, Misumi 5 Series, and 80/20 20 Series Package contains 50 screws