Bosch Bulldog Tough 4 Cutter 18 in Alloy Steel Masonry Drill Bit for SDS Plus Drill Yellow Dichromate Adjustable spill proof glass shelves with Item Weight:14.1 Adjustable spill proof glass shelves with raised edges keep small spills from becoming big messes The forward handles transfers the weight of the tool from the front to back over your hand which allows for more control for 2X life in concrete with rebar and hard aggregate Four cutter head design – ensures that one angle is always hitting rebar to help prevent the bit getting stuck Four flute bit technology – aggressively pulls dust away from hole Durable SDS plus® bit design – features a four cutter head with four flute technology