Product details:

Quantity: 25 Material: Steel Diameter: 1/2 (0.500 Decimal) Length: 3 Machine Thread: 1/2-13 Driver: 1/2-13 Hanger Bolt Driver General Use: To Attach An Object With An Internal Machine Thread To Wood (Such As Floor Door Stops And Furniture Legs). Also Used To Hang Material From A Wood Structure. Properties: One End Has A Lag Style Spiral Thread And The Opposite End Has A Machine Thread.