uxcell M4x50mm Button Head Hex Socket Cap Screw Bolt Black 35pcs Drive Type: Hex Socket; Head Style: Button Head; Material: 10.9 Alloy Steel Package Content: 35pcs x Button Head Screws; Product Name: Button Head Screws Thread Size: M4x50mm/0.16"x2"(D*L); Weight: 148g Thread Pitch: 0.7mm; Total Length: 52mm/2.1" Hex Socket Width: 2.5mm/0.1"; Head Size: 7x2mm/0.28"x0.08"(D*H)