Uxcell a16032800ux0989 Binding Screw 4Mm x 4Mm Metal Binding Chicago Screw Post Binder Sliver Tone 15 Pcs Product Name: binding screw; material: metal Weight: 5G; Package Content: 15 x binding screw Main Color: sliver tone; fit hole size: 4 x 4mm/0.16" x 0.16" (d*l) Thread length: 5mm/0.2" Head Dia: 8.7mm/0.34"