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TCT ANNULAR CUTTER ALSO CALLED TCT BROACH CUTTER OR TCT CORE DRILL,TCT CORE BIT, TCT hole Saw. TCT means Tungsten Carbide Tipped. Which cutting teeth is Carbide Tips brazed, usually thinking as the replacement or upgrade of HSS Annular cutter. It is a new type of drilling tools, which support Magnetic Drill. 
TCT ANNULAR CUTTERS Usage:
TCT ANNULAR CUTTERS same to HSS Annular Cutter widely used in railways, bridges, ship building, boilers, machinery manufacturing, environmental protection, oil and gas pipline industries.Annular Cutters are perfect for making holes in metal pipes and tubes because their design minimizes damage to the metal. 
specially for cutting cast iron, cast steel, carbon steel, alloy stee, stainless steel, copper, aluminum, etc. 
Annular Cutters have a hollow center so the cutting is spread out all along the rim of this bit. With these cutters, less metal is actually being cut and the cutting is more spread out. This is why annular cutters make holes with less effort and collateral damage than a traditional bit.
Performance: Annular Cutters are ideal for minimizing collateral damage on the work piece. These cutters make quick work of punching through a variety of metal materials. Annular cutters work by drilling out just the perimeter of the hole and punching out the center. This reduces the overall effort and time needed to create the hole. HIGRED Annular Cutters are a must have for your metal drilling needs..
MANUFACTURING features:

• universal standard 19.05mm(3/4") diameter shank for various magnetic drills.

• Unique tooth geometry, cutting teeth specially grinding by CNC Machine to assure all of teeth in same level,allows for better centering and faster cutting.

• Thin wall design enables cutters to cut faster and more efficiently by removing less material during drilling

• Shorter flute design allows for chips to fall freely from cutter,

• Lower friction

• Reduce damage of tips

• Ejector pins can be used on all diameters for 25mm(1") depth and 50mm(2") depth, ejector pin sold separately

• Ejector pin extends 12.5mm(1/2") beyond tooth tip allowing for easier, faster location of pin on hole

• Shank available: Nitto Shank (One touch), Weldon shank, Fein Shank (quick-in), thread shank

• Cutting deepth: 35mm, 50mm, 75mm, 100mm,150mm

• Diameter range: 11-160mm, 7/16-6-9/32inch