Description: 51mm hole cutter (TCT hole saw) KKMOSS has more than 44 carbide hole saws in sizes from 12mm to 200mm. If you need to choose a different diameter from the list, you can customize it according to your needs. Cutting depth: within 25mm of metal thickness. Shank size: diameter 10mm Applicable tools: drill bit, drill die impact drill, CNC drilling machine High-quality carbide sand and excellent brazing technology provide a very long service life. Precise cuts and high-quality cut surfaces are achieved with excellent hole sawing technology. Hole Saw - The stepped pilot bit design prevents the pilot bit from hitting the carbide teeth as it passes through the cutting material. KKMOSS carbide hole saws last 10 times longer than regular hole saws. Quickly and accurately drill holes in a variety of materials based on thousands of active laboratory tests. KKMOSS hole saws have the same excellent test results as the best brands on the market, with reliable product quality. The hole saw smoothly cuts materials up to 25mm thick or less, such as stainless steel, high alloy steel, aluminium, plastic, FRP and PVC. Drill bits are widely used in home improvement projects such as drilling holes in kitchen metal panels, door structures and cable boxes. Widely used in factory heating, ventilation, air conditioning, etc. Precise holes are drilled in the electrical box for smooth assembly of buttons, switches and displays. NOTE: For safety, wear goggles and gloves when using the hole saw kit. What else can KKMOSS do  30-day unconditional return policy.