-20, Construction Stainless Steel, Hex 1/2 in, Includes Locking Nut, Bolt Length 2.19 in, Load Capacity 1000 lb, Thread Size 1/4 In.Level Mount,Swivel Stud,1/4-20,1in Base 1 in, Height 3.5 in, Finish Stainless Steel, Base Material Stainless Steel, Bolt Material Stainless Steel, Base Stainless Steel.