450
I don't know what chain came with your boat, but as a second anchor the F37 is a good choice. Since it is a second anchor, it will not be going through the chain gypsy. Lifting the F37 by hand is not so bad being aluminium. I would, however, recommend that you use 3/8" chain to help the lightweight anchor set and stay set. I would use at least 40 feet of chain, followed by 3/4" 3-braid nylon rode. I assume your primary anchor is a Delta. If you are cruising and anchoring out, you might consider getting at least 150' of 3/8 chain followed by 3/4 rode for the primary anchor. The original Lewmar windlass that came with my 450 would work with both 5/16 and 3/8 chain (BBB). I have since changed my windlass to a Vetus. We anchor out for six months at a time in the Bahamas and the Lewmar kept eating up brushes since it is a two-wire type motor that is overworked. The Vetus is a three-wire motor and much, much larger for a similar pull rating. For additional information on anchoring, you might want to listen to "The Anchoring Dance" by Eileen Quinn. It's a hoot!