FLEX IMPACT SHIELD - Built for demanding applications HEAT TREATED WITH PREMIUM MATERIAL COMPOSITION - Maximum strength for unrivaled bit life 2PC HIGH QUALITY CR-MO THIN WALL DEEP NUT SOCKETS WITH DUAL HOLE DESIGN - Extends productivity of your FLEX Impact Driver to accommodate more applications FULL RANGE OF BITS - Includes Hex and Slotted impact bits not typically found in most impact sets FLEX STACK PACK BIT CASE - Organize and customize your layout while keeping everything together and easily accessible with FLEX STACK PACK connection