Drywall Finishing Tools
Choose a joint knife and a taping knife by working width
Match the contact edge to the step in the joint rather than using one blade width for every pass.
Start with the joint and surrounding space
A narrow joint knife is easier to place on a small repair and leaves working room at a wall edge. A wider taping knife gives more room to feather a seam into the surrounding board. Compare the listed blade width with the space available for a pass.
Read blade material and flex separately
Stainless and high-carbon steel name the blade material. Flexible, stiff, or precision-ground refer to different properties. Check the maker's flex description for the exact width and material you plan to buy.
Check the compound pan alongside the knife
A wider knife needs enough usable pan opening to load it without catching the ends. Compare the blade width with the interior length where you will scoop, allowing for tapered sides and clearance.