The single spring features 24 wire thickness with 1.75 inner diameter Wire sized and wound for proper tension and long life Springs treated with rust preventative Includes bolt plug and winding plug wound onto spring for stronger design.Specifications: Overall Length: 36″ 24 wire thickness 1.75 inner diameter Wire sized and wound for proper tension and long life Springs treated with rust preventative Includes bolt plug and winding plug wound onto spring for stronger design