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Weighing about 2.5 lbs square foot - about the same as 1/4-inch think flat sheet fiberglass plate, the grating over the flume is cut into sections so that it can be easily removed. Handholds are then either cut into each section or a bar of the grating is removed at one end of a grating section to allow an operator's gloved hand to lift the grating section out of the way.
A taper bit's primary function lies in its unique design. It features a non-uniform diameter along its length, with the cutting edge being narrower than the shank, resulting in a tapering effect as it drills into the material. The percentage mentioned in 'taper bit' refers to the angle or slope of the taper. For instance, a 1% taper over a 1-foot length would mean that the bit narrows by 1/100th of its starting diameter over that distance.