uxcell M4x20mm Button Head Hex Socket Cap Screw Bolt Black 50pcs<div style="text-align: left;"><strong>[Product Information]</strong><br><ul><li>Drive Type: Hex Socket; Head Style: Button Head; Material: 10.9 Alloy Steel</li><li>Package Content: 50(+/-2%)pcs x Button Head Screws; Product Name: Button Head Screws</li><li>Thread Size: M4x20mm /0.16"x0.8"(D*L); Weight: 101g</li><li>Thread Pitch: 0.7mm; Total Length: 22mm/0.87"</li><li>Hex Socket Width: 2.5mm/0.1"; Head Size: 7.5x2mm/0.3"x0.08"(D*H)</li></ul></div><img src="http://ecx.images-amazon.com/images/I/41NoKMS5LRL.jpg" noproxy>