These blades are sharpened on the outside of the curve and help to avoid damage to paint when removing excess urethane after a windshield removal or removing urethane with shattered tempered glass fragments. 

Set Includes 3-"Winged" blades (1/2", 3/4" and 1"), one 1-9/16" wide prep blade, 1-WK7 handle and 1-hex key.