Made of top quality materials. Made of special tool steel, with excellent resistance to degradation as a result of intensive and continuous use. Consisting of: heads 1/4 "with diameter: 4-4.5-5-5.5 -6-7-8-9-10-11-12-13-14 mm ,, extension 1/4", top S 0,6X4 -0.8X5.5-1.2X6.5 mm, PH1-PH2-PH3, PZ1-PZ2-PZ3, T10-T15-T20-T25-T30. The special prec steel body makes the work easy even in the most difficult working conditions.