Manufacturers are using more and more unique fasteners to keep us out of their stuff. That way, they think you'll have to pay them to fix or replace it! Even if I can't fix the part, at least I can poke around and identify the problem so some technician doesn't pull the wool over my eyes. Now you can have full access to those frustrating tamper-resistant fasteners. This set includes all the tamper and regular bits you'll ever need (Spline, Clutch, Torq Set Screws, Tri-Wing, Square Recess, Spanner, Pozidriv®, Metric and Inch Hex, TORX®, TX tamper-proof, Wing Nut Driver, 4-13mm sockets, 5/32-1/2" sockets) You get the picture. Other accessories include a magnetic bit holder and handle, hex extensions, all in a well organized case. When you buy this set, don't throw away the ingenious plastic cover insert; it holds everything in place so the set of bits stay organized and when you open up the box. Outstanding quality. Imported. THE most complete set of bits I've ever seen.