Dimensions: 13 x 38 x 19mm (L x W x H); internal dimensions: 37 x 12mm (L x W). Note: The inside opening has a partition. Use: Rectangular chair leg caps make it easy to move and noiseless when installing them at the bottom of the application, such as chairs and chairs. desk legs. Fits 0.5" x 1.5" O.D. rectangular tubing (no hole size). Designed to fit 13mm x 38mm (outer diameter) rectangular tubing. Function: Ribbed black plastic caps are perfect for preventing scratches on kitchen or wood floors or as protective pads on chair end caps, bench legs, table legs, bar stool glides, patio furniture inserts, and much more. They are also designed to withstand impact and harsh weather conditions. Wide Application: Black tube inserts serve as a durable solution for many household or outdoor projects, including replacements for fence posts. fence/fencing, gate post covers, trailer frame ends, pipe post rod caps, metal bike rack fittings, forged steel end caps or any square opening. Color : Black Quantity: 20 pieces