• CR-MO alloy steel for long life • Stubby one piece design fits into tight areas • Fully guaranteed • Heavy duty blow molded storage case • Set includes: 1/4", 5/16",3/8", 7/16", 1/2", 9/16", 5/8", 3/4" and 6mm, 7mm, 8mm, 10mm, 12mm, 14mm, 17mm, 19mm