8 x 18 Master Offset Power Trowel Combination Blade is made of heavy-duty .074 thick steel to precise specifications for best performance. 8 x 18 Master Offset Power Trowel Combination Blade is a channel mount blade that fits 46-inch master power trowel machines. 8 x 18 Master Offset Power Trowel Combination Blade (RC46) 4 pack.