$9.87 Including Tax is $12.27
0.3125" Bore; 0.312" Head Width; Female, Right Hand Thread, Stud
$11.58 Including Tax is $14.40
0.375" Bore; 0.359" Head Width; Female, Right Hand Thread, Stud
$14.34 Including Tax is $17.82
0.4375" Bore; 0.406" Head Width; Female, Right Hand Thread, Stud
$22.46 Including Tax is $27.92
0.50" Bore; 0.453" Head Width; Female, Right Hand Thread, Stud