DEWALT DWA1SP4IRB 1-Inch Spanner Number-4 IMPACT READY FlexTorq Bits, 50-Pack CNC machined for optimal fit into the screw recess Reflex core allows 2" bits to flex up to 15-degrees to reduce breakage Part of the 10X Magnetic Screw Lock System for fastener retention - minimizes drops and reduces wobbling Impact ready bits with FlexTorq have increased durability for long life