Check whether the center drill is tightened, turn on the machine and check the concentricity of the hole saw.
eBay
TCT Hole Saw 12-200mm Carbide Hole Saw Tungsten steel Cutter for Stainless Steel, Metal, Iron, Wood Metal Cutting Kit
Aliexpress UK
1 x Hole Saw drill bit. Uses: Opening hole. Made of premium M42 high speed steel, sturdy and durable. Material: M42 High Speed Steel.
eBay
M42 BI -Metal Wood Hole Saws Bit Tooth Cutting For Metal Plastic Fiberboard 1PC 20mm-200mm Hole Saws
Aliexpress UK
Wide Size Range – 14mm to 210mm – Covers everything from small access holes to large pipework. Variable Tooth Pitch – Faster, smoother cutting with reduced vibration. Drill Sets. Perfect for pipe entries, downlights, cable runs, and more.
eBay
1Pc 6-200mm Diamond Brazed Core Dry Drill For Porcelain Tiles Marble Glass Granite Hole Saw Cutter Accessories Saw Cutting
Aliexpress UK
These hole saws are perfect for use in stainless steel, plastic, wood,cast iron and similar materials. Variable pitch - 4/6 T.P.I.
eBay
Cost Sale of 1PC 56-83*150/180/200mm*M22 Wet Diamond Hole Saw Core Bit For Drilling Holes On Marble/Granite/Concrete/Wall
Aliexpress UK
Hardened HSS Teeth. For Materials Such As Cast Iron, Stainless & Structural Steel, Alloyed & Non-Alloyed Aluminium, Bronze, Copper, PVC, Acrylic & Wood. Flexible High Carbon Steel Backing for Fast Clean Cuts.
eBay
HSS Steel Drilling Hole Saw Drill Bit Cutter Bi-Metal for Aluminum Iron Stainless Steel DIY Wood Cutter Drill Bits 1Pc 16-200mm
Aliexpress UK
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1pc 100-200mm M42 Bi-Metal Drill Bit HSS Hole Saw for Metal Iron Aluminum Stainless Plastic DIY Wood Cutter Tools
Aliexpress UK
Material:TCT Hole Saw. Material:TCT(YG10X cutter head） Alloy steel. Handle: Triangle Shank. For specifications of 50mm and above, the shank is 12mm. The power of hand drill must be greater than 750W. Sizes: 12 - 200 mm. ).
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1pc 15-200mm M42 Bi-Metal Hole Saw HSS Drill Bit for Metal Iron Aluminum Stainless Plastic DIY Wood Cutter Tools
Aliexpress UK
Includes spring-loaded pilot bit for wobble-free starts. Fits all drills (handheld/bench/magnetic) with 10mm hex shank. Effortlessly cuts stainless steel, cast iron, aluminum, plastics, wood, and drywall.
eBay
Hole Saws 1PC 20mm-200mm M42 Bi-Metal Drill Bit Cutter Carpentry Tools Cutting Metal Plastic Iron Hand Tools
Aliexpress UK