This is Interchangeable Slotted; Cross Point; Hexagon; Hexagon Ball; Nut Spinner; O; E Wrench Screwdriver Set 28 Piece manufactured by CK. The manufacturer part number is RS_157-1604. The tip is slotted: 0.64; 1.02; 1.40; 1.78; 2.03; 2.54 mm; cross point: #1; #2; hexagon/hexagon ball: 0.028; 0.035; 0.050; 0.062; 0.078; 0.093 in; nut spinner: 5/64; 3/32; 7/64; 1/8; 5/32 in; o/e wrench: 5/64; 3/32; 7/64; 1/8; 5/32; 3/16; 1/4; 5/16 in in size. The built-in exquisite tip is a slotted; cross point; hexagon; hexagon ball; nut spinner; o; e wrench tip. The product consists of 28 pieces.