Engineered with high-strength forged steel for optimized performance in heavy-duty applications. The following sizes are included: ",3/8", 7/16" 1/2, 9/16, 5/8, 11/16, 3/4, 13/16, 7/8, 15/16, 1", 1-1/16", 1-1/8", 1-1/4", 1-1/2", 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, 16mm, 17mm, 18mm, 19mm, 20mm, 21mm, 22mm, 23mm, 24mm, 3" Extension.