For Bruce anchors sizes 22 lbs
Holes are 3/8" in diameter with a 4 hole pattern
The first set of holes is 17/8" from the edge of the anchor roller to the center of the hole. They are 1.8" apart center to center of holes. The next set of holes is roughly 6" center to center of holes.Overall Length: 22.75"
Outside channel Width: 3.5"
Inside channel Width: 3"