5/16 Inch-18x1/2 Inch Hex Socket Button Head Bolts Screws 25pcs Drive Type: Hex Socket; Head Style: Button Head; Material: 304 Stainless Steel Package Content: 25 x Button Head Screws; Product Name: Button Head Screws; Thread Size: 8 x 12mm/5/16" x 1/2"(D*L) Weight: 165g; Main Color: Silver Tone Thread Pitch: 18G; Hex Key Width: 6mm/0.24" Head Size: 14 x 5mm/0.55" x 0.2"(D*T); Overall Size: 14 x 17mm/0.55" x 0.67"(D*L)