Milwaukee SHOCKWAVE Impact Duty 3-1/2" Phillips Power Bit

Both. The SHOCKWAVE Impact Duty bits are built for impact drivers as well as standard drill drivers. The SHOCKZONE section of the shank is what makes the difference, it flexes to absorb peak torque from the impact mechanism instead of snapping, and the shank geometry is tuned per tip type.

No - they drive different fasteners. The Milwaukee SHOCKWAVE 3-1/2 inch power bit comes with a Phillips point in #2 and #3 sizes, so it drives cross-recess screws. The Rack-A-Tiers 70462RY is a hexagonal magnetic driver bit in the C-Rhex series, which seats over a hex head fastener rather than into a recess. If you are setting hex-head sheet metal or self-drilling screws, the 70462RY is the right tool; for Phillips-recess screws you need the SHOCKWAVE Phillips bit.

That is the point of the 3-1/2 inch length. A standard 1 inch insert bit bottoms out in a counterbore or a deep electrical box; a 3-1/2 inch power bit gets the driver chuck clear of the work and reaches screws set down in a recess or behind framing. It is a one-piece bit, so you do not need a magnetic holder to get the length.

Yes. Power bits of this type use the 1/4 inch hex shank with a detent groove, so they drop straight into the quick-change collet on an impact driver or into any 1/4 inch hex chuck or bit holder.

Cam-out usually comes from a tip that does not seat fully in the recess, and it gets worse under impact. These SHOCKWAVE bits use a customized tip geometry Milwaukee calls Ultimate Fit, meant to seat tighter and reduce stripping, plus a wear guard on the tip and a custom heat treat for bit life. Using the right point size matters as much as the bit, #2 for most common wood and drywall screws, #3 for the larger heads.

The SHOCKWAVE 3-1/2 inch Phillips power bits are a bulk 25 pack, which is how most electrical and framing crews buy a consumable bit they will go through on a job.

The Milwaukee SHOCKWAVE Phillips power bit measures 3-1/2 inches overall, which gives reach but needs clearance ahead of the chuck. For close-quarters work the Rack-A-Tiers 70462RY is a 2-inch driver bit, about an inch and a half shorter, with a magnetic hexagonal tip in the C-Rhex series. Note the fastener change: the 70462RY drives hex heads, not Phillips recesses, so it only substitutes if the screws in the assembly are hex head.

The Rack-A-Tiers 70462RY is specified as a hexagonal magnetic driver bit, so the magnet is part of the fastener-retention design on that one. The Milwaukee SHOCKWAVE 3-1/2 inch Phillips power bit is built around tip and shank durability instead - a wear-guard long-lasting tip, custom heat treat, and a SHOCKZONE shank optimized per tip type to absorb peak torque from impact drivers. If one-handed overhead screw holding matters more than impact torque life, that difference is the deciding factor.

A Phillips power bit will not drive a hex washer head screw. For that you want a magnetic hex driver, such as the Rack-A-Tiers 70462RY 2 inch Malco C-Rhex magnetic driver bit. Keep the SHOCKWAVE Phillips bits for #2 and #3 Phillips recesses.

Milwaukee builds them from a proprietary steel with a custom heat treat, rather than a plain off-the-shelf tool steel. They are made in Vietnam.