When a screw sits behind a pipe, inside a cabinet or between two studs, the driver itself often does not fit. Three kinds of accessory solve that: a rigid bit extension, a flexible shaft and a right angle head. This guide compares them using maker specifications and published user reports. Torque Digest has not tested any of these products.
Rigid bit extensions
The simplest option is a straight extension that adds reach. DEWALT’s MAXFIT 6 inch extension, as listed by Farm and Fleet, is made of metal, has a magnetic screw lock that holds fasteners on the bit tip, and uses an impact rated hex shank, so it works with impact drivers and standard drills. The listing also mentions a built-in torsion zone that absorbs high torque stress and a quick-release mechanism for fast bit changes.
A rigid extension keeps the bit perfectly in line with the driver, which suits straight, deep holes. It does nothing for clearance around corners.
Flexible shafts
A flexible shaft bends around obstacles. DEWALT’s FLEXTORQ system includes a 12 inch straight flexible shaft in its 4 in 1 set, alongside compact and standard right angle heads. The maker says the head is 1.5 in high for tight access, the system is impact type and magnetic, and the gears give 10x longer life. DEWALT lists no torque rating on that page.
ToolGuyd reviewed an older DEWALT flex shaft attachment with a 12 inch shaft, a true 90 degree head and a removable side handle. The site saw no reason it could not work with a drill or cordless screwdriver, and thought it suited screwdriver bits better than drill bits. Readers in the comments, giving opinions and not test data, questioned how well impact blows pass through a flexible shaft and warned that the shaft can spin and bite if the bit binds. Keep a firm grip on the support handle.
Right angle heads
A right angle head turns the bit 90 degrees, which helps when you can only approach from the side. The FLEXTORQ compact head is a good example of how short these have become. They lose some leverage, so expect to work at lower speed.
What it means for you
Choose a rigid extension when you only need reach, a flexible shaft when the path bends, and a right angle head when height is the problem. For driving screws, the maker specs point to impact rated, magnetic parts. Always check the length, shank and impact rating on the listing before buying.
The Where to buy box also includes a budget flexible extension from Geinxurn. We could not verify its specifications, so read the listing carefully before you order.
