M4x10mmx0.5mm Stainless Steel Round Flat Washer for Bolt Screw 100Pcs Product Name: Flat Washer; Material: Stainless Steel Weight: 34g; Package Content: 100(+/-2%) x Flat Washer Main Color: Silver Tone; Inner Dia: 4mm/0.16" Outer Dia: 10mm/0.4" Thickness: 0.5mm/0.02"