Material: High quality plastic square plug made of heavy black polyethylene, good load bearing capacity, wear resistant and heat resistant. Firm and Quiet: Provides smoother movement of the furniture. The patio chair slides on the floor, reduces noise. Protects your deck surface, deck chair legs and deck legs from damage. Easy to install: put it in the pipe, tighten it until it there is no space. Sometimes you can use a hammer for some help. Wide Application: Perfect for chairs, tables, stools, office and patio furniture, prevent scratches and slips on hardwood floors; fits on fence post pipes, gate posts, trailer frame ends, exercise equipment to prevent bumping. Product dimensions: 1" square plug in outside diameter, this cap fits 25 x 25 mm tubing with a smooth, smooth appearance. Color: Black Quantity: 20 pieces