Here is a 7 Piece Impact Driver Tool Set for your 1940 - 1966 Cadillac. Don't destroy your hardware by using the wrong tool. Set Includes: 1- Impact Driver - 1/4 Hex, 3- Phillips Bits - #1, #2 & #2 Long, 1- Straight Bit - 3/16, 2- Hex Head adapters - 3/16 & 5 /16, 1- Bit Holder