The 20-0048-0159 from Nolato is a EMI Shielding Wire Mesh with Attenuation 45 to 125 dB (MONEL), 40 to 125 dB (ALUMINIUM), 60 to 125 dB (TCS), 40 to 125 dB (Stainless Steel), E Field Attenuation 1 MHz to 100 MHz: 100 to 125 dB(Monel) 100 to 125 dB(Aluminium) 108 to 125 dB(TCS) 100 to 125 dB(Stainless Steel), Frequency 10 KHz to 10 GHz, H Field Attenuation 10 KHz to 1 MHz, 45 to 60 dB (Monel), 40 to 60 dB(Aluminium), 60 to 85 dB (TCS), 40 to 58 dB(Stainless Steel), Plane Wave Attenuation 400 MHz to 10 GHz, 80 to 98 dB(Monel), 65 to 95 dB(Aluminium), 62 to 99 dB(TCS), 60 to 94 dB(Stainless Steel). More details for 20-0048-0159 can be seen below.