This item is a set of shelf support nuts. Made from strong carbon steel with electroplating process, they are strong and practical for long time use. Compatible only with pole diameter 25.4mm/1" or 25.0mm screw-in style poles. More importantly, they are ideal replacement pieces that save you from throwing out the metal shelving unit. Features - Brand: DOITOOL. - ColorSilver - Material: Carbon steel. - Size: About 3.20X2.30X3.20cm/1.26X0.90X1.26inch. - Made from strong carbon steel with electroplating process, it is strong and practical for long time use. - Bright surface, no burr, clear screw thread. Resistant to rust and corrosion - Compatible only with pole diameter 25.4 mm/1" or 25.0 mm screw-in style poles - Provide strong support for your storage rack, thread in easy - ideal replacement piece and save you from throwing out the metal shelving unit Package list: 12 x DOITOOL Shelf Support Nut