Bullet_point: ['4-1/2" X 1/4" Top Plate with 2-5/8" X 3-5/8" Mounting hole spacing for 3/8" hardware', '600 pound capacity; RWM lubricates all swivel sections prior to shipment & notched yokes are standard', 'Cold formed top plate, yoke and button are all heat treated to prevent brinelling, improve swivel action and increase service life', 'Top plate and legs are 1/4" steel, legs formed for increased strength and inside and out continuously welded to yoke', 'Zinc plated to protect against corrosion; All swivel sections are equipped with a lubrication fitting for field maintenance'] (Page 1)