These screw at # 10 in size and maybe a little large, black in color, square drive, drill tip ends, I bribe they were originally use is to hold insulation to metal roof deck on commercial buildings, they are great fasteners for lots of work, there are approx. 1/3 or more of a 5 gallon bucket, both sizes are in same bucket, $15.00 for all the screws photos for length
