BGenuine Unistrut P4008-EG 38" Strut Channel Nut With Short Spring for P3300, P4000, P4100 and All 1316" Tall Strut Channel ReviewbP PP Genuine Unistrut P4008-EG 38" Strut Channel Nut With Short Spring for P3300, P4000, P4100 and All 1316" Tall Strut Channel PGenuine UNISTRUT BrandPChannel Nut With SpringPFor use with: P3300, P4000, P4100, P4520 and All 1316" Tall Strut ChannelsPNut thread size: 38"-16PFinish: Electro-Galvanized; ASTM B633, Type IIIP