Made of top quality materials. Made of special tool steel, with excellent resistance to degradation as a result of intensive and continuous use. Consists of: 1/2 "heads with diameter: 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 27, 30, 32mm , 1/2 "extender, special prec steel body, makes work easy even in the most difficult working conditions.