G-37 18lb Guardian Anchor for 42'-47' Boats Boat size recommendations are for boats of average windage and proportions in 30 knots of wind, average bottom conditions, and moderate protection from open seas. Remember that the loads in 42 knots of wind are twice as much as in 30 knots. Use three-strand nylon rope, 6-12 ft (2-4 m) of chain and a minimum of 5:1 scope. Also, a minimum of 6 ft (2 m) of chain should be used for every 25 ft (8 m) of water depth. For storm conditions use an anchor one or two sizes larger. Specifications: Boat Length: 42-47ft/12-14m Weight: 18lbs/8kg Holding Power: 32 (Hard Sand): 7,500lbs/3,402kg Holding Power: 32 (Soft Mud): 1,500lbs/680kg Shank: 38"/97cm Fluke: 22"/56cm Stock: 31"/79cm Proof Coil Chain: 3/8"/10mm Nylon Rope: 5/8"/16mm Shackle Size: 3/8"/10mm *Note: Hard sand holding power figures above represent loads actually achieved on production Fortress and Guardian anchors under controlled horizontal pull conditions without dragging or resulting in disabling structural deformation.