uxcell 4 x 15 x 1mm Insulation Nylon Spacer Flat Washer Gasket Ring 50pcs Product Name: Nylon Flat Spacer; Material: Nylon 6/6 Weight: 10g; Package Content: 50pcs(+/-2%) x Nylon Spacer Main Color: White; Inner Dia: d: 4mm/ 0.16" Outer Dia: dc: 15mm/ 0.6"; Thickness: h: 1.0mm/ 0.04" Fireproofing Grade: 94V-2; Operating Temperature: -20-120 Degree