28 specialist bits for all fine mechanics and electronic jobs use for opening camera cases mobile phones samsung apple htc etc laptops and a lot more good torque transmission long life and wear resistance set consists of 28 micro screwdriver bits 4 x 28 mm sl bits 15 2 25 3 mm ph 00 0 1 2 cross slotted pz 0 1 cross slotted tr tr4 tr5 tr6 tr7 tr8 tr9 tr10 tr15 for samsung hex 09 13 15 2 25 3 tri wing 15 2 pen