Ryobi A961412 141 Piece Driving Set with Carrying Case, Nut Drivers, and Socket Adaptors 1/4 INCH HEX SHANK SIZE: These will fit into the standard shank for drill / drivers and electric screwdrivers. This hex shank also makes them compatible with many impact drivers 105 INSERT BITS INCLUDED: These are your standard bits for driving fasteners. They include: (Hex: 2 x 1/16, 2 x 5/64, 4 x 3/32, 2 x 7/64, 2 x 1/8, 2 x 9/64, 2 x 5/32, 2 x 3/16, 2 x 1/4, 2 x 9/32) (Phillips: 2 x P0, 2 x P1, 15 x P2, 2 x P3) (Square: 2 x SQ0, 2 x SQ1, 12 x SQ2, 2 x SQ3) (Slot: 2 x SL4, 2 x SL6, 2 x SL8, 4 x SL10, 2 x SL12) (Torx: 2 x T6, 2 x T7, 2 x T8, 2 x T9, 2 x T10, 2 x T15, 4 x T20, 10 x T25, 2 x T27, 2 x T30, 2 x T40) 24 POWER BITS INCLUDED: These bits have longer shanks than traditional insert bits, providing improved stability. Here, they come in 2 inch and 3 1/2 inch length. Included: (2 INCH: 2 x P1, 5 x P2, 2 x T20, 3 x T25, 2 x SL8-10, 4 x SQ2) (3 1/2 INCH: 1 x SQ2, 1 x SL8-10, 1 x P1, 1 x P2, 1 x T20, 1 x T25) 8 NUT DRIVING HEADS: Added on are some heads you can use in hex fasteners. They include (1 x 1/4, 1 x 9/32, 1 x 5/16, 1 x 11/32, 1 x 3/8, 1 x 7/16, 1 x 15/32, and 1 x 1/2) 3 SOCKET ADAPTORS will work with sockets onboard your drill. These include (1 x 1/4, 1 x 3/8, and 1 x 1/2)