uxcell M4x18mm Hex Socket Head Knurled Cap Screws Bolts Nuts Set 20Pcs Drive Type: Hex Socket; Head Style: Socket Cap Head; Material: Stainless Steel Package Content: 20Sets x Hex Socket Cap Screws; Product Name: Hex Socket Cap Screws; Thread Size: M4x18mm/0.16"x0.71"(D*L) Weight: 67g; Fastener Type: Socket Screw; Main Color: Silver Tone Thread Pitch: 0.7mm; Total Length: 22mm/0.87"; Head Size: 7x4mm/0.28"x0.16"(D*H) Hex Nut Size: 7x3mm/0.28"x0.12"(W*T); Hex Socket Size: 4mm/0.16"