Saw Hole saw for core drill bit diameterDiameter 55mm The core drill bit is made of carbide alloy steel, the blade is extremely sharp and resists cutting. saw Hole saws bimetallicA twist drill bit inside faster, which is removable and replaced. Safe collarWith built-in safety collar to prevent excessive drilling. Use forCan be clamped on hand drill and bench drill for thick sheet steel, cast iron, stainless steel, non-standard angle iron and other metal open holes. Hole saw in metal carbide Made of high quality hard alloy, durable. Precision ground tungsten carbide teeth for long life and fast cutting. Each edge is part of the characteristics of cutting work, which makes the hole difficult to produce the collapse phenomenon. Fine grinding center drill The hole saw has a twist drill bit inside, which is removable and replaced. Smooth cutting ensures precise drilling. Carbide teeth and core drilling hole Carbide teeth for quickly cutting clean, round holes. Core hole makes it easy to remove debris from the internal space. Non-slip triangular drill shank The triangular shank design effectively prevents slipping during drilling. Sharp and anti-cutting gears with lower consumption make the product have a long service life. specification Balance Tolerance of +/- 0.003 in. Materia Carbide alloy < p>Application Real tool, Design your life- Suitable Quick and precise hole cutting in stainless steel, mild steel, iron, copper and brass . Not applicable Concrete, stone, ceramic tile, glass. Package includes 1 x drill bit of hole When trephining, please wear good protective measures, in case wood chips are thrown on the eyes. The size for manual measurement, it may There may be an error of 0-5mm, belongs to the normal phenomenon. The knife is sharp enough, keep away from children. Suitable machines Electric hand drill Motor drill Mobile magnetism ribbon drill