#10-24 Socket Head Cap Screws. These take a hex / allen key to drive and are made from alloy steel with Thermal Black Oxide coating.

Available in 3/8" to 1" lengths

Diameter : #10 (or 3/16")
Thread Pitch : 24 TPI - UNC / Coarse Thread
Length : Please select from drop down menu above.
Type : Socket Head Cap Screw (SHCS)
Matching Nut & Washers : #10-24 - Available here
System of Measurement : Standard (Inch / U.S.)
Material : Black Alloy Steel - Class 12.9. Equivalent
Specifications : ASTM A574