DEWALT DW55100B25 Solid Carbide High Impact SDS, 7/32 X 4 X 6-1/2-Inch Solid carbide SDS drill bit - retail MSRP $251.44, 96% off -> $10.26. From the amazon.ca product description: 1/2" Solid Carbide HIGH IMPACT SDS+ (Bulk 25) 2X More Carbide for Long Life. Four flute design cleans debris out for fast, efficient drilling. Four flute design cleans debris out for fast, efficient drilling. Innovative Bonding System delivers extreme durability. Innovative Bonding System delivers extreme durability.All the other sizes of the solid carbide SDS bits are on sale too for ~50% off, which means they are still over $120...