SRAM X7 3x10 MTB Crankset Compatibility & Specifications

Sram X7 3x10 MTB Crankset 2011 model series.
I am not sure to understand why Sram does so much marketing effort to promote the 2x10 speed concept and selling 3x10 crankset in the same time.

X-Glide 3X10 shifting technology, 22-33-44 gearing
The widest gear range available
X-Glide Technology
Fastest front shifting ever
44-33-22 Gear ratio chainrings
The speed of a real big ring with 7.8 meters per revolution (44-11)
The climbing ability of a real granny ring with 1.3 meters per crank revolution (22-36)

Arm Material AL-7075
Chainring Material Steel
Available Arm Lengths 170/175
Compatibility 10 speed chains
Finish StormGrey (STGRY)
Required installation tools: torque wrench, 8mm hex key, and Truvativ GXP bottom bracket tool (TL2342) or equivalent from Shimano TL-FC2 or Park Tool BBT-9C

Compatible with Giga X Pipe (GXP) Bottom Bracket type: Truvativ Giga X Pipe, Sram Press fit BB, Sram/Truvativ GXP Ceramic BB with PressFit Adaptor MTB, Sram PressFit GXP BB 92mm MTB.

Compatible with 10 speed chains Sram: PC-1091R, PC-1091, PC-1071, PC-1051, PC-1031.

Compatible with Shimano 10 speed chains: CN-7901, CN-7900, CN-6700, CN-6701, CN-5701, CN-7801, CN-6600, CN-5600.

Compatible with Campagnolo 10 speed chains: Record 10s, Veloce 10s.

Compatible with KMC chains: X10, X10SL.

Park Tool Removal Tool for International Bottom Bracket Bearings

Park Tool BBB-2 The Big Blue Book of Bicycle Repair - 2nd Edition