Marshalltown BI146D -20 X 3 1/8 Broken-In Mag Hand Float-DuraSoft HdlMARSHALLTOWN Broken In Magnesium Hand Floats come out of the box pre shaped for immediate use. The broken in style eliminates the common break in period needed for most concrete tools, and the pre worn edges reduce the risk of gouging wet concrete when youre preparing the surface for troweling. We also recommend using these Floats to achieve professional grade finishes on all air entrained concrete work. The magnesium blade material is lightweight,