Check whether the center drill is tightened, turn on the machine and check the concentricity of the hole saw.
eBay
M42 Bi-Metal 1/2" Band Saw Blades. 1140 1400 1425 1790 2240 x 13mm With 6, 14Tpi Bandsaw Blade Cutting Hardwood, Aluminum
Aliexpress UK
1pc x Diamond drill bit Hole Cutter. 【Diamond Brazed Hole Saw】Suitable for porcelain, glass, marble, ceramics, rock and granite. Brass Reducer Connect BSP Female Male Thread Reducing Joint Pipe Converting 2PCS.
eBay
Mini Chainsaw Cordless 6 Inch with 1x1.5Ah Battery,21V Handheld Small Chain Saw for Wood Cutting Tree Trimming Gardening
Aliexpress UK
Description:Hole saw is made of HSS high speed steel, with extremely sharp cutter, low consumption and durable with impact resistance, wear resistance.High precision, smooth cutting and high hardness. Openings for iron, aluminum, and various types of pipes.Hole saw creates a hole in the work piece without having to cut up the core material.Hole saw is perfect for Installing Locks, Knobs in Doors and Cabinets in Seconds, which make the job quick and easy. Hole saw works with the ordinary electric drill and is good for drilling large diameter holes through Desks, Home Wood, Aluminum Plate, Alloy Plate, Plastic Sheet etc. Specification:Product Name: Hole SawMaterial: HSSMain Color: Black, Silver ToneTwist Bit Diameter: 5mm / 0.2 inchShank Diameter: 8mm / 0.3 inchTotal Length: 67mm / 2.
eBay
Makita Mini Electric Chain Saw Cordless Pruning Saw Garden Power Tools Compatible with 18v Battery Brushless Motor
Aliexpress UK
This tile hole saw are made of industrial grade carbon steel with nickel-plated coated body that resist corrosion. 12Pcs 6mm Diamond Coated Drill Bit. Perfect for drilling glass, tile bottles, blocks jars, fiber glass porcelain tile ceramic, vitrified, brick and stone.
eBay
21V 6inch Portable Chainsaw with 2 Batteries, Lightweight One-Hand Chainsaw Suitable for Tree Pruning
Aliexpress UK
Circular Hole CutterThe hole saws are suitable for cutting Wood, Plastic, Mild Steel, Stainless Steel, Cast Iron, Brozen, Cupper, Aluminium etc. They are perfect cutting tools for installing recessed lights, downlights into ceiling or floor, for punching big holes at wall to fit vent pipes or extract fans, for drilling holes on desk or drywall for cables installation.
eBay
8inch Handheld Chainsaw,Cordless Electric Chainsaw with Brushless Motor, 2 Batteries,Safety Lock, Suit for Garden Courtyard
Aliexpress UK
4/5/6/7/8/10/11PCS Diamond Drill Set Ceramic Tile Drill Porcelain Stoneware Stone Drill Set Granite Blade Thickness 1.4 mm Bit Length 60mm. The drill bits will perform wonderfully while water is applied, while they also do well in dry cutting.
eBay
DayPlus NEW 21V Mini Chainsaw 6-Inch Cordless Electric Handheld Pruning Shear Saw with Chain for Tree Branch Cutting 2 Batteries
Aliexpress UK
New high quality diamond drill bit. Pls note：The diamond drill bit have no central pilot drill. Chip hole design, which is conducive to chip removal, can be easily mounted on the electric drill to save manpower.
eBay
Makita 7000RPM Brushless Electric Chain Saw 600W Cordless Handheld Chainsaw For 18V Graden Pruning Power Tool
Aliexpress UK
1 x Hole Saw Cutter. -- These hole saws are ideal for work where high performance and accuracy are needed. We will do our best to help you solve the problem. Colour: As Shown.
eBay
Makita 6-Inch Electric Chainsaw Handheld Portable Garden Pruning Saw Wood Cutting Power Tool Compatible with 18V Battery
Aliexpress UK