42PC DRIVER BIT SET48 32 1554 DRIVER BITS ARE MADE OF PREMIUM GRADE S2 TOOL STEEL FOR INCREASED DURABILITY SET INCLUDES A VARIETY OF TIP TYPES FOR THE MOST COMMON FASTENING APPLICATIONS MAGNETIC DRIVE GUIDE HOLDS FASTENERS IN PLACE WHILE THE SLEEVE RETRACTS AS THE SCREW IS DRIVEN INTO THE MATERIAL ACCESSORY CASE ROWS HOLD BITS SECURELY IN PLACE FOR TRANSPORT ROW DESIGN ALLOWS FOR EASY INSERT & REMOVAL OF BITS ACCESSORY ROWS CAN ATTACH TO MILWAUKEE DRILLS & IMPACT