Cut the stucco or brick at  a 3/4" depth using a abrasive or diamond blade.
Bricks can also be cut at the mortar joints. 

Step 3
  Tap the counter flashing into the cut in stucco\bricks using a block of wood to avoid denting the metal.

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 Specifications:   

Folds 3/8" and 1" depths
18" overall length for easier hand folding
Sight holes for proper depth alignment
Black powder-coated low carbon steel to resist rust
18" L x 3-1/4" W x 7/32" H
Weight: 2 lbs.    
More info

Buy the metal bender now:

Only:$21.95

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Allow 4-10 days for delivery.

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