Weld-On Round Jack Tube. Male Mount - Fits Inside Jack Mounting Tube Use with 9/16" Pin and Chain, Part No. 018403 Weld Mounting Tube on to Trailer Tongue pinhole Diameter: 9/16" Outer Diameter of Tube: 2" Length of Tube: 1 7/8"

Jack Mounting Bracket Use with 1/2" Plunger Pin, Part No. 18400 Weld Bracket on to Trailer Tongue Pin hole Diameter: 1/2" Snap Ring not included, Part No. 18405

Ring Thickness: .079 inches Use with 80580 and 15909 Mounting Brackets Inside Diameter:  2.25" Will not fit RAM12MB

Weld-On Round Jack Tube. Tubular Male weld-on for 9/16" pull pin for 2,000 lb jacks and 5,000 lb topwind jacks only Male Mount - Fits Inside Jack Mounting Tube Weld Mounting Tube on to Trailer Tongue pinhole Diameter: 9/16" Outer Diameter of Tube:...

Female Mount - Fits Outside Jack Mounting Tube Inner Diameter of Tube: 2.5" Use with 5/8" Pin and Chain, Part No. 700026 Weld Mounting Tube on to Trailer Tongue Length of Tube: 2.5" Pin Hole Diameter: 5/8"

Jack Mounting Bracket Pinhole Diameter: 3/8" Weld Bracket on to Trailer Tongue Replacement 3/8" Plunger Pin is not Use with Snap Ring, Part No. 18405 Snap Ring not Included

Weld-On Round Jack Tube. Outer Diameter of Tube: 2" Male Mount - Fits Inside Jack Mounting Tube Use with 5/8" Pin and Chain, Part No. 700026 Weld Mounting Tube on to Trailer Tongue pinhole Diameter: 5/8" Length of Tube: 2"

Weld Bottom Support Plate to Underside of A-Frame Hole Diameter: 2.29"

Mounting Bracket for RAM Jacks Use with 1/2" Plunger Pin, Part No. RAM12P Weld Bracket on to Trailer Tongue Pinhole Diameter: 1/2" Snap Ring not included, Part No. RAM12SR

Replacement Snap Ring on RAM Jacks Ring Thickness: .103 inches Use with mounting bracket part number:  RAM12MB Inside Diameter: 2.25"