The hole saw, also known as the hole saw or hole saw, refers to a special circular saw in the processing of circular holes in modern industry or engineering. It is simple and flexible to operate, convenient to carry, safe and widely used. The hole opener (cutter) is installed on the ordinary electric drill, and it is convenient to cut round holes, square holes, triangular holes, straight lines and curves on the plane and sphere of various plates such as copper, iron, stainless steel and plexiglass.
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Drum drum suitable loading capacity of 1/2 ~ 2/3, hexagonal or octagonal drum load less, such as 1/3 amount can also get satisfactory rolling quality.
The above type of roller is suitable for the rolling of aluminum parts. But it's slightly better with a drum. 
ã€China Aluminum Industry Network】 There are two types of roller used in general rolling, namely drum drum and hexagonal or octagonal drum.