Suncor Stainless Offers Cast Iron Folding Grapnel Anchors. This Folding Anchor Includes One Shackle And Is Ideal For Small Crafts In Rocks And Muddy Bottoms. These Anchors Range In Sizes From 1.5 Lbs To 33 Lbs And A Suitable For Small Boats, Canoes, Kayaks, Jetskis And As A Dinghy Anchor.