Heavy Duty Fasteners, 1"" x 1"", Clear, 6/Pack, Sold as 6 Each Super duty fasteners hold up to 10 pounds. Super duty fasteners hold up to 10 pounds. Great for mounting heavy decor, tools, signage and more. Locks 3 times stronger than hook and loop fasteners. Works on most painted, varnished or sealed surfaces, including wood, metal, brick or concrete.