Power bits made of Cr-V steel, and wear well from professional treated. 
Face treated by special technical to prolong use life. 
Combined with HSS twist drill bits for metal, made of high speed steel, and wear well from professional treated.
With removable storage and kept in plastic box.
29pc kit, included: 

5pc Titanium Coated HSS twist bits: 4-5-6-8-10mm;
24pc 6.35x25mm power bits:
Philips 2X#1,3X#2,3X#3;
Torx:T10,T15,T20,T25,T27,2xT30,T40;
Hex:1.5,2.0,2.5,3.0,4.0,5.0,5.5,6.0mm