1/4 Inch-20x1/2 Inch Hex Socket Head Cap Screws Bolts Black 100Pcs Drive Type: Hex Socket; Head Style: Socket Cap Head; Material: 12.9 Alloy Steel Package Content: 100(+/-2%)pcs x Socket Head Cap Screws; Product Name: Socket Head Cap Screws; Thread Size: 1/4"x1/2"(D*L) Weight: 480g; Main Color: Black Thread Pitch: 20G; Total Length: 18mm/0.7" Head Size: 9 x 6mm/0.35" x 0.24"(D*T); Hex Width: 5mm/0.2"