Comparison : Item # 4-40 x 1/4 HSCS Brass-Button, 4-40 Diameter and 1/4 Inch (in) Length Brass Button Head Socket Cap Screw
Item # 4-40 x 3/8 HSCS Brass-Button, 4-40 Diameter and 3/8 Inch (in) Length Brass Button Head Socket Cap Screw
Item # 4-40 x 1/2 HSCS Brass-Button, 4-40 Diameter and 1/2 Inch (in) Length Brass Button Head Socket Cap Screw
Item # 4-40 x 5/8 HSCS Brass-Button, 4-40 Diameter and 5/8 Inch (in) Length Brass Button Head Socket Cap Screw
Item # 4-40 x 3/4 HSCS Brass-Button, 4-40 Diameter and 3/4 Inch (in) Length Brass Button Head Socket Cap Screw