Premium quality insert bits are made of S2 tool steel for long life and extreme durability. Magnetic drive guide provides easy screw placement and prevents bit from slipping off of screw. The unique case provides individual storage for the insert bits as well as storage for the drive guide. A magnet on the under side of the case allows it to be attached to most metal tool boxes, job storage boxes, truck boxes, or other metal surfaces for quick and easy access. Includes: 19 of the most commonly used screw driver bits (Phillips, square drive, Torx , and slotted), magnetic drive guide, and magnetic storage case. No. 48-32-1700: Pieces In Set: 20-Piece, Pkg Qty: 1, Package Type: Clamshell