5-1/2" x 5-1/2" Swivel Square Base Plate (BP5S) – CBM Scaffold
Stainless Steel 316 Grade Square Base Cover and Plate for 1-1/2" Post
Amazon.com: Cedarslink Jumbo 26"x39" Aluminum Square Base Plate Compatible With All Major Name Brands. Largest Truss Base! Ultra Thick 8.3mm. Aluminum : Musical Instruments
Square Channel Base Plate 316 | Plasti-Bond
Stainless Steel 316 Grade Square Base Cover and Plate for 1-1/2" Post
C.R. LAURENCE SA30BS CRL Brushed Stainless Square Base Plate for 1-1/2" Square Tubing - Amazon.com