IVY Classic 44070 1-Inch #2 Phillips ACR Insert Bit, Impact Plus, 20-Piece Contractor Pack ACR bits with forged ribs grip the screw reducing cam-out stripping of screw and bit High-grade S-2 Tool Steel for extra strength and durability Designed to withstand the high torque (rotational force) of impact drivers, Impact Plus (Registered Trademark) Heat treated and tempered to Rockwell Hardness 60 - 62, sandblasted finish prevents rust Length: 1-inch, Size: Phillips ACR #2, Shank: 1/4-inch hex, Convenient snap-open contractor pack