[Anchor Bolts Specifications] Diameter-1/4", Length-2-1/4", Qty-50 pieces [Heavy Duty Material] Our wedge anchors are made from carbon steel, finished with zinc to prevent rust for long and durable using [Ideal Applications] Concrete anchor bolts work well for any mounting and structural anchorage purpose in any condition, suitable for applications in solid concrete and cement, Do not use in block or brick base material [Multi-Purpose] Wedge anchor bolts for concrete are designed for both indoor and outdoor use. Must be inserted for minimum embedment depth to obtain minimum holding values, and comes assembled with nut & washer for your convenience [Easy to Use] Just drill a hole as big as the diameter of the anchor in concrete (larger holes may cause the bolt to spin when tightening) , remove debris and dust from the hole, hammer the concrete bolts into the hole, then tighten the nut with a wrench to complete the installation Hromigry Wedge Anchor Bolts, Heavy Duty Anchors for Concrete, Anchors Bolts for Indoor and Outdoor Applications Our wedge anchor bolts for concrete are available in diameters of 3/8", 1/2", 5/8", and are available in zinc plated carbon steel and stainless steel to make the through bolt resistant to rust. Wedge anchors can be used in solid concrete applications, and suited for fastening purposes such as structural anchorage, storage racking anchorage, metal doors and window frames, wall mounting, plumbing systems, electrical equipment, machinery and hand rails installation, etc. Package include50 pieces wedge expansion anchors, each with one nut and one washer. Installation Instructions 1. Using the hammer drill to drill a hole in the concrete, which is as big as the diameter of the wedge anchor. 2. Clean out all the dust and debris of the hole. 3. Hammer the anchor into the drilled hole to the desired depth. 4. Tighten the nut with a torque wrench to ensure the bottom portion wedge is expanded in order to lock the anchor in place firmly. NotesPlease do not use in block or brick base material, only suitable for cement, solid concrete and grout-filled concrete masonry.