Insert bits are made of high grade S2 tool steel providing long life. Magnetic drive guide with retracting sleeve holds long fasteners in place, the sleeve retracts as the screw is driven into the material. Compact puck style case. Magnetic case attaches to the lid or side of most metal tool boxes, job storage boxes, truck boxes, etc. This 20 piece insert bit set includes insert bits made of high grade S2 tool steel for long life and extreme durability. 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 - the set can be stored where it won't get buried by other tools or accessories. Set contains insert bits: Phillips (1) P1, (7) P2, (1) P3; square (1)S1, (3)S2, (1) S3; Torx (1) T15, (1) T20, (1) T25; slotted (1) SL6-8, (1) SL8-10; magnetic screw guide and case.