Master Mechanic 42pc Screwdriver Bit Set Includes: (1) compact magnetic bit holder, (1) 1/4 in. nut driver, (1) 5/16 in. nut driver, (2) double ended power bits, (1) PH1 insert bit, (5) PH2 insert bits, (2) PR2 insert bits, (2) PH3 insert bit, (1) SQ1 insert bit, (3) SQ2 insert bits, (1) SQ3 insert bit, (1) T15 insert bit, (3) T20 insert bits, (3) T25 insert bits, (1) T30 insert bit, (1) slotted #6 insert bit, (1) slotted #8 insert bit, (1) slotted #10 insert bit, (1) 3/16 hex insert bit, (1) 1/4 in. hex insert bit, (1) PH1 power bits (3) PH2 power bits, (1) PH3 power bit, (1) SQ2 power bit, (1) T20 power bit, (2) T25 power bits