The RAM-B-347U base consists of a B size 1" diameter rubber ball connected to a 2" x 1.7" square base. The base has four pre-drilled holes at each corner, using the universal AMPS hole pattern.
4-Hole AMPS: 1.181" x 1.496"
1/4"-20
2" X 1.7"
B Size (1")
Standard Use: 2 lbs
Heavy-Duty Use: 1 lb
Marine-grade aluminum
0.13 lb