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This BLACK Hope 40t-REx (40 tooth ratio expander) allows you to upgrade your existing 11-36 10spd cassette to give an 11-40 range
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The hope T-REx adapts a 11-36 10spd cassette to give an 11-40t range
T-REx ring installs behind existing cassette, replacing one of the smaller sprockets, usually 17t
Shimano and Sram specific tooth profiles and shifting
Shimano XT and XTR 11-36 10spd cassettes
Sram PG1030, PG1050 and PG1070 11-36 cassettes
Note: As you are taking out one of the middle sprockets, there will be a bigger jump between those gears - but you will benefit from increased climbng capability due to the lower gear provided by the 40 tooth sprocket.
Also note: You may need to increase your chain length to accomodate the larger sprocket