20 x 36 x 3mm Insulation Nylon Spacer Flat Washer Gasket Ring 50pcs Product Name: Nylon Flat Spacer; Material: Nylon 6/6 Weight: 115g; Package Content: 50pcs(+/-2%) x Nylon Flat Spacer Main Color: White; Inner Dia: d: 20mm/ 0.8" Outer Dia: dc: 36mm/ 1.4"; Thickness: h: 3mm/ 0.12" Fireproofing Grade: 94V-2; Operating Temperature: -20-120 Degree