Manhole Collar,23 1/2 in dia., Base Installation Portable, Brand and Series 3M DBI-SALA Advanced, Color Green, Compatible Component Lower Mast Extension, One-Piece Arm, Confined Space Component Base, Confined Space Item Base, Diameter 23 1/2 in, For Manhole Dia. 24 in to 26 in, For Max. Manhole Dia. 26 in, For Min. Manhole Dia. 24 in, For Use On Manholes, Includes Carry Handles Yes, Material Aluminum, Mounting Location Manhole, Mounting Type Clamp-On, Series Advanced, Sleeve Material PVC