【Heavy - Duty Steel Construction】Crafted from high - quality steel with a powder - coated finish,this kayak storage rack features enhanced strength, toughness, corrosion resistance, waterproofness, and scratch resistance. The reinforced support arms and main poles have a total load - bearing capacity of up to 600 lbs,50% higher than similar products (300 lbs). When you don't use the wheels, its load - bearing capacity can be further increased. 【Larger - Size Movable Wheels】Equipped with 4 detachable wheels (2 with brakes), the 5 - inch - large wheels enhance the load - bearing capacity and make it easier to move on flat ground or beach. 【Scratch - resistant Sleeves & Secure Straps】The support arms are fully covered with thickened scratch - resistant sleeves to protect your kayak. The 6.5ft sturdy straps can fix your kayak and the rack when moving, ensuring stability and no shaking. 【Adjustable Width】You can adjust the width of the rack freely by two knobs in the middle to better fit your kayak. The width can be adjusted between 50 - 78 inches.（It is recommended to use a tool to tighten the knobs after adjusting the width to ensure greater stability.） 【Versatile Use】Our outdoor kayak storage rack with wheels can be moved freely between indoor and outdoor places. The steel surface has been treated for rust resistance, which can withstand the erosion of saltwater, sunlight, and rain. You can safely place it in the garage, dock, kayak rental shop, campsite, etc. Dimensions: Hanging Arm Length: 19.7 inches Vertical Wall - hanging Length: 9.8 inches Spacing between Upper and Lower Walls: 26.8 inches Base Width: 31.50 inches Minimum Base Length: 50.8 inches Maximum Base Length: 78.0 inches Ruler Length: 31.5 inches Wheel Size: 5 inches