The 6" Margin Trowel easily fits into mixing buckets and should be used to apply thin-set in hard-to-reach areas, such as underneath toe kicks and cabinets. The 1/4 in. x 1/4 in. x 1/4 in. notch size is for installing floor tile up to 8 in. by 8 in. The non-slip, rubber grip reduces job fatigue for comfortable, repeat use.