REFINA 18" SKIM BLADE. The Plaziflex have a flexiback design that gives flexibility across the blade width but rigidity along the length. These blades are used with the mini trowels. The mini trowels have a stainless steel blade with alloy shank and soft handle; they slot into the plastic blade holder bracket on the flexible plastic blade. The plastic blades allow easier and faster closing in and flattening of the final finish coat. There is less need to wait for plaster to pick up, and can be used effectively when plaster is still wet