Square Head Set Screw

      Buyers Products Square Head Set Screw comes in two sizes to fit your drive shaft set screw needs. It's sold in multiples of 100.
    14 Square Head Set Screw 1/4-20 x 3/4 Inch
    34 Square Head Set Screw 3/8-16 x 3/4 Inch With 3/32 Inch Diameter Hole