Whitecap Stainless Steel Danforth/Fortress Anchor Roller Whitecap’s Anchor Rollers make anchoring and anchor retrieval easier. This anchor roller works with boats ranging from 16′ to 54′ in size and is best suited for use with Danforth and Fortress anchors. These rollers are constructed of durable 304 stainless steel and are available in three lengths. Specifications: Part Number Length Line Size Width Inside Width Fastener Boat Length AR-6487 16″ 1″ 3-1/2″ 1-3/4″ 3/8″ (3) 16′ – 20′ AR-6488 19″ 1-1/2″ 5″ 3″ 3/8″ (3) 25′ – 35′ AR-6489 26″ 1-1/2″ 5-1/2″ 3-1/2″ 3/8″ (3) 25′ – 54′