5/16 Inch-18 x 5/8 Inch Hex Socket Button Head Bolts Screws 15pcs Drive Type: Hex Socket; Head Style: Button Head; Material: 304 Stainless Steel Package Content: 15 x Button Head Screws; Product Name: Button Head Screws; Thread Size: 8 x 16mm/5/16" x 5/8"(D*L) Weight: 112g; Main Color: Silver Tone Thread Pitch: 18G; Hex Key Width: 5mm/0.2" Head Size: 14 x 5mm/0.55" x 0.2"(D*T); Overall Size: 14 x 21mm/0.55" x 0.83"(D*L)