1/4 Inch-20x1/2 Inch Hex Socket Button Head Bolts Screws 50pcs Drive Type: Hex Socket; Head Style: Button Head; Material: 304 Stainless Steel Package Content: 50(+/-2%) x Button Head Screws; Product Name: Button Head Screws; Thread Size: 1/4" x 1/2"(D*L) Weight: 200g; Main Color: Silver Tone Thread Pitch: 20G; Hex Key Width: 4mm/0.16" Head Size: 11 x 5mm/0.43" x 0.2"(D*T); Overall Size: 11 x 17mm/0.43" x 0.67"(D*L)