The Pelsue Model #SB-SM2 4-Arm Manway Base is specifically designed to provide a portable mounting point for a Pelsue Model #FT-C70 Fall Arrest Tower. The four arms that extend from the base plate of the Model #SB-SM2 pivot independently, and are equipped with sliding bolting blocks that can be secured at any point along the leg's length. These two features allow the Model #SB-SM2 to mount over a large variety of sizes of manways up to a 26-5/8 in maximum diameter bolt circle. The Model #SB-SM2 is constructed of steel with a powder coated finish. The Model #SB-SM2 is only rated for usage in conjunction with a Pelsue Model #FT-C70 Fall Arrest Tower and must be operated according to the supplied Product Manual.