... type (3pcs) :1.5mm. 2.0mm 2.5mm(commonly used)"*" type (4pcs) :T3. T4. T5. T6.(suit for mobile phone ... harddisk,printer ,XBOX,XBOX360,shaver etc..)type (2pcs) :0 1 (suit for palm ,mobile phone)"Y" type (2pcs) :Y0 Y1 ... .T6 for disk axis .2 .T10 suit for XBOX .T4 T5 suit for laptop HDD .T10 is better than ... head "U "type M2.6: U4 , “ type,suit for Philip air cleaner or some high-class sockettype screwdriver ...