WorkPro Screwdriver bit Set - 10 Piece are 2" long and composed of CRV for durability. Including 10 piece 2 inch screwdriver bits, 10- 2 inch Screwdriver Bits: Phillips: Ph1,Ph2,Ph3 Slotted: 3/16,1/4 Square: S1, S2. Hex: H5/32,H3/16,H1/4 .Unique design! 10 pieces set in one. You just need one piece of our tool,which can be applied to muti-task mode.Original design make it can be put in a key ring as a key. So convinent and you deserve it. Anyway, it is the best choice for you to work ot you need in dailylife.These phillips and square bits fit for electric screwdrivers, hand screwdrivers, electric drills, air drills and so forth.