Product Description The screws are dense, stable, easy to install. Firm and durable. The plastic bottom protects the floor from non-slip and stable design. 1. Use a piece of tape on a 5/16" drill bit as a depth gauge. 2. Drill a 5/16" hole with a depth of 4/5 at each corner. 3. Use a hammer to hit the T nut with wood. Application scene Leveling foot suitable for washing machine, refrigerator base, chair, table, cabinet, dresser, POS displays, metal furniture, all kinds of mechanical equipment, fitness equipment, TV stands, shelves, beach chairs, etc. Good for protecting your floor and reducing noise. It can be easily installed as long as the inner diameter of the fixing hole is M8. Leveling screw size.